A daily school, exam, and bill search — marks, discounts, and GST maths. This page has 100 important questions and answers. Original explainer for daily search — not a government login or live tracker.
A percentage is “per hundred.” To find X% of Y, compute (X ÷ 100) × Y. To find what percent A is of B, compute (A ÷ B) × 100. To find the new price after a 20% off sale, take 80% of the old price — or subtract 20% of it.
Exam marks: (marks scored ÷ total marks) × 100. A 15/20 test is 75%. GST on a bill: if the tax is 18% inclusive, the tax portion is not the same as 18% added on top — inclusive and exclusive GST use different rearrangements.
Percent change is ((new − old) ÷ old) × 100. A rise from 80 to 100 is +25%, not +20. People mix this up every day on salary and inflation headlines.
100 important questions. Quick 10 is a random set; Full set plays every question.
Your score
100 questions and answers
Each item is a 4-option MCQ. Open a question, tap A–D. Green is correct, red is wrong. Original explainers — not copied match reports.
1. 1% of 500 is
Tap A, B, C or D.
Answer: C) 5
1% means ÷ 100.
2. 5% of 200 is
Tap A, B, C or D.
Answer: C) 10
0.05 × 200 = 10.
3. 15% of 80 is
Tap A, B, C or D.
Answer: D) 12
0.15 × 80 = 12.
4. 25% of 360 is
Tap A, B, C or D.
Answer: A) 90
A quarter of 360 is 90.
5. 12.5% of 80 is
Tap A, B, C or D.
Answer: D) 10
12.5% is one-eighth.
6. Marks 18/25 as a percent are
Tap A, B, C or D.
Answer: A) 72%
(18 ÷ 25) × 100 = 72.
7. Marks 45/60 as a percent are
Tap A, B, C or D.
Answer: D) 75%
45 ÷ 60 = 0.75.
8. A 10% rise on 250 is
Tap A, B, C or D.
Answer: A) 275
10% of 250 is 25.
9. A 10% fall on 250 is
Tap A, B, C or D.
Answer: C) 225
250 − 25 = 225.
10. Percent decrease from 50 to 40 is
Tap A, B, C or D.
Answer: C) 20%
(10 ÷ 50) × 100 = 20.
11. If 30% of a number is 90, the number is
Tap A, B, C or D.
Answer: A) 300
90 ÷ 0.30 = 300.
12. If 40% of a number is 64, the number is
Tap A, B, C or D.
Answer: A) 160
64 ÷ 0.40 = 160.
13. A 5% GST added on ₹200 (exclusive) is a bill of
Tap A, B, C or D.
Answer: C) ₹210
5% of 200 is 10.
14. 18% exclusive GST on ₹1,000 makes the tax
Tap A, B, C or D.
Answer: C) ₹180
0.18 × 1000 = 180.
15. A price that already includes 18% GST: tax is not
Tap A, B, C or D.
Answer: D) 18% of the shelf price in the exclusive sense
Inclusive tax = price − price/1.18.
16. Doubling a quantity is a
Tap A, B, C or D.
Answer: A) 100% increase
New = 200% of old; the rise is 100%.
17. Halving a quantity is a
Tap A, B, C or D.
Answer: C) 50% decrease
You still have half.
18. 3:2 as first-to-total percent for the first part is
Tap A, B, C or D.
Answer: C) 60%
3 / 5 = 0.60.
19. 0.2 as a percent is
Tap A, B, C or D.
Answer: A) 20%
Multiply by 100.
20. 2.5 as a percent is
Tap A, B, C or D.
Answer: B) 250%
2.5 × 100 = 250.
21. A successive 10% then 10% off is not
Tap A, B, C or D.
Answer: C) a flat 20% off
0.9 × 0.9 = 0.81, so 19% off.
22. Profit 20% on cost 500 is a selling price of
Tap A, B, C or D.
Answer: A) 600
20% of 500 is 100.
23. Loss 10% on cost 400 is a selling price of
Tap A, B, C or D.
Answer: C) 360
10% of 400 is 40.
24. What percent is 7 of 35?
Tap A, B, C or D.
Answer: D) 20%
7 ÷ 35 = 0.20.
25. What percent is 9 of 12?
Tap A, B, C or D.
Answer: C) 75%
9 ÷ 12 = 0.75.
26. A ratio 1:4 means the first is
Tap A, B, C or D.
Answer: B) 20% of the total parts
1 of 5 parts.
27. Percentage points from 8% to 11% rose
Tap A, B, C or D.
Answer: D) 3 points
The relative rise is 37.5%, which is a different sentence.
28. To reverse a 25% increase, you do not divide by
Tap A, B, C or D.
Answer: D) 1.25’s opposite as “minus 25% of the new” blindly
New ÷ 1.25 = old.
29. 80 is 40% of
Tap A, B, C or D.
Answer: A) 200
80 ÷ 0.40 = 200.
30. A test weighted 70% exam + 30% internals: 80 and 60 give
Tap A, B, C or D.
Answer: D) 74%
0.7×80 + 0.3×60 = 56+18.
31. Simple interest 8% for 1 year on 1,000 is
Tap A, B, C or D.
Answer: D) 80
Interest and amount are different words.
32. A pie-chart 90° slice is
Tap A, B, C or D.
Answer: C) 25% of the circle
90/360 = 1/4.
33. A pie-chart 36° slice is
Tap A, B, C or D.
Answer: C) 10% of the circle
36/360 = 0.10.
34. Rounding 66.6% of 90 for marks is still based on
Tap A, B, C or D.
Answer: C) (scored ÷ total) × 100 first
Then round as the board asks.
35. A 2-for-1 deal is not automatically
Tap A, B, C or D.
Answer: D) 50% off each item in every shop’s small print
Read whether the second is free.
36. Population growth 2% on 50 million is
Tap A, B, C or D.
Answer: C) 1 million extra
0.02 × 50m = 1m.
37. A discount of ₹60 on ₹400 is
Tap A, B, C or D.
Answer: A) 15%
60/400 = 0.15.
38. Finding “how many % more is 24 than 20” uses
Tap A, B, C or D.
Answer: D) ((24−20)÷20)×100
That is +20%.
39. A calculator % key
Tap A, B, C or D.
Answer: D) still needs you to know of-what
Percent of the wrong base is a common bill error.
40. This page does not
Tap A, B, C or D.
Answer: C) file your GST return
Use the official portal for tax filing.
41. 0% change means
Tap A, B, C or D.
Answer: D) new equals old
The base is unchanged.
42. A negative percent change means
Tap A, B, C or D.
Answer: B) the new value is smaller than the old
Salary cuts and price drops use the same maths.
43. The official source for “how to calculate percentage” (learn desk, item 1) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
44. The official source for “how to calculate percentage” (learn desk, item 2) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
45. The official source for “how to calculate percentage” (learn desk, item 3) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
46. The official source for “how to calculate percentage” (learn desk, item 4) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
47. The official source for “how to calculate percentage” (learn desk, item 5) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
48. The official source for “how to calculate percentage” (learn desk, item 6) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
49. The official source for “how to calculate percentage” (learn desk, item 7) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
50. The official source for “how to calculate percentage” (learn desk, item 8) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
51. The official source for “how to calculate percentage” (learn desk, item 9) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
52. The official source for “how to calculate percentage” (learn desk, item 10) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
53. The official source for “how to calculate percentage” (learn desk, item 11) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
54. The official source for “how to calculate percentage” (learn desk, item 12) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
55. The official source for “how to calculate percentage” (learn desk, item 13) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
56. The official source for “how to calculate percentage” (learn desk, item 14) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
57. The official source for “how to calculate percentage” (learn desk, item 15) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
58. The official source for “how to calculate percentage” (learn desk, item 16) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
59. The official source for “how to calculate percentage” (learn desk, item 17) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
60. The official source for “how to calculate percentage” (learn desk, item 18) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
61. The official source for “how to calculate percentage” (learn desk, item 19) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
62. The official source for “how to calculate percentage” (learn desk, item 20) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
63. The official source for “how to calculate percentage” (learn desk, item 21) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
64. The official source for “how to calculate percentage” (learn desk, item 22) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
65. The official source for “how to calculate percentage” (learn desk, item 23) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
66. The official source for “how to calculate percentage” (learn desk, item 24) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
67. The official source for “how to calculate percentage” (learn desk, item 25) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
68. The official source for “how to calculate percentage” (learn desk, item 26) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
69. The official source for “how to calculate percentage” (learn desk, item 27) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
70. The official source for “how to calculate percentage” (learn desk, item 28) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
71. The official source for “how to calculate percentage” (learn desk, item 29) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
72. The official source for “how to calculate percentage” (learn desk, item 30) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
73. The official source for “how to calculate percentage” (learn desk, item 31) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
74. The official source for “how to calculate percentage” (learn desk, item 32) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
75. The official source for “how to calculate percentage” (learn desk, item 33) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
76. The official source for “how to calculate percentage” (learn desk, item 34) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
77. The official source for “how to calculate percentage” (learn desk, item 35) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
78. The official source for “how to calculate percentage” (learn desk, item 36) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
79. The official source for “how to calculate percentage” (learn desk, item 37) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
80. The official source for “how to calculate percentage” (learn desk, item 38) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
81. The official source for “how to calculate percentage” (learn desk, item 39) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
82. The official source for “how to calculate percentage” (learn desk, item 40) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
83. The official source for “how to calculate percentage” (learn desk, item 41) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
84. The official source for “how to calculate percentage” (learn desk, item 42) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
85. The official source for “how to calculate percentage” (learn desk, item 43) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
86. The official source for “how to calculate percentage” (learn desk, item 44) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
87. The official source for “how to calculate percentage” (learn desk, item 45) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
88. The official source for “how to calculate percentage” (learn desk, item 46) is
Tap A, B, C or D.
Answer: D) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
89. The official source for “how to calculate percentage” (learn desk, item 47) is
Tap A, B, C or D.
Answer: C) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
90. The official source for “how to calculate percentage” (learn desk, item 48) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
91. The official source for “how to calculate percentage” (learn desk, item 49) is
Tap A, B, C or D.
Answer: A) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
92. The official source for “how to calculate percentage” (learn desk, item 50) is
Tap A, B, C or D.
Answer: B) the authority or standard named on this page’s explainer
GKSchools English practice is original — not an official script.
93. X% of Y is
Tap A, B, C or D.
Answer: C) (X ÷ 100) × Y
20% of 250 is 50.
94. Marks 36 out of 40 as a percent are
Tap A, B, C or D.
Answer: B) 90%
(36 ÷ 40) × 100 = 90.
95. A 20% discount on ₹800 leaves
Tap A, B, C or D.
Answer: D) ₹640
20% of 800 is 160; 800 − 160 = 640.
96. Percent increase from 80 to 100 is
Tap A, B, C or D.
Answer: A) 25%
(20 ÷ 80) × 100 = 25.
97. To get the original price after 10% off, divide the sale price by
Tap A, B, C or D.
Answer: C) 0.90
Sale = 90% of original.
98. 50% more than 40 is
Tap A, B, C or D.
Answer: A) 60
Half of 40 is 20; 40 + 20 = 60.
99. A fraction 3/4 as a percent is
Tap A, B, C or D.
Answer: D) 75%
3 ÷ 4 = 0.75.
100. Percentage is not
Tap A, B, C or D.
Answer: D) the same as a percentage-point change
Rates from 2% to 3% rose 1 point, which is a 50% rise.
