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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 343 · 40 questions
TalentJR

The method (Start value is 100%): New value after a rise of p%: value + p% of value. After a fall: value − p% of value. Percent change = change ÷ starting value × 100. Two changes a% and b% one after the other: a + b + (a × b) ÷ 100, with a fall counted as minus.

NameDateTime takenScore ___ / 40
  1. 1.A town has 2820 people. Its population grows by 25%. How many people live there now?
  2. 2.A water tank holds 420 litres. 5% of the water is used. How many litres are left?
  3. 3.A water tank holds 3980 litres. 10% of the water is used. How many litres are left?
  4. 4.The price of a bicycle is ₹4760. It goes up by 40%. What is the new price (in ₹)?
  5. 5.A water tank holds 2080 litres. 20% of the water is used. How many litres are left?
  6. 6.The price of a bicycle is ₹4020. It goes up by 15%. What is the new price (in ₹)?
  7. 7.A price goes up by 10% and then goes up by 15% more. By what percent has it gone up in all? =
  8. 8.The price of a school bag changes from ₹2100 to ₹2520. By what percent did it go up?
  9. 9.A water tank holds 1960 litres. 50% of the water is used. How many litres are left?
  10. 10.A town has 440 people. Its population grows by 25%. How many people live there now?
  11. 11.A shop sells 2660 cups of tea a month. Next month it sells 40% more. How many cups does it sell next month?
  12. 12.The price of a school bag changes from ₹400 to ₹240. By what percent did it come down?
  13. 13.The price of a school bag changes from ₹440 to ₹462. By what percent did it go up?
  14. 14.A town has 2680 people. Its population grows by 10%. How many people live there now?
  15. 15.A town has 3440 people. Its population grows by 15%. How many people live there now?
  16. 16.The price of a bicycle is ₹4780. It goes up by 30%. What is the new price (in ₹)?
  17. 17.A water tank holds 3140 litres. 50% of the water is used. How many litres are left?
  18. 18.A water tank holds 100 litres. 10% of the water is used. How many litres are left?
  19. 19.A water tank holds 2920 litres. 25% of the water is used. How many litres are left?
  20. 20.A shop sells 4980 cups of tea a month. Next month it sells 5% more. How many cups does it sell next month?
  21. 21.A price comes down by 25% and then comes down by 40% more. By what percent has it come down in all? =
  22. 22.A price goes up by 15% and then goes up by 40% more. By what percent has it gone up in all? =
  23. 23.A price goes up by 10% and then goes up by 50% more. By what percent has it gone up in all? =
  24. 24.A town has 1280 people. Its population grows by 50%. How many people live there now?
  25. 25.The price of a school bag changes from ₹1640 to ₹1230. By what percent did it come down?
  26. 26.A water tank holds 2520 litres. 10% of the water is used. How many litres are left?
  27. 27.A water tank holds 1620 litres. 50% of the water is used. How many litres are left?
  28. 28.A water tank holds 4620 litres. 5% of the water is used. How many litres are left?
  29. 29.The price of a school bag changes from ₹3040 to ₹3800. By what percent did it go up?
  30. 30.A shop sells 2920 cups of tea a month. Next month it sells 10% more. How many cups does it sell next month?
  31. 31.The price of a school bag changes from ₹4300 to ₹4515. By what percent did it go up?
  32. 32.A price goes up by 30% and then comes down by 15%. By what percent has it gone up in all? =
  33. 33.The price of a school bag changes from ₹1080 to ₹1026. By what percent did it come down?
  34. 34.The price of a bicycle is ₹1280. It goes up by 40%. What is the new price (in ₹)?
  35. 35.The price of a school bag changes from ₹3960 to ₹3564. By what percent did it come down?
  36. 36.The price of a bicycle is ₹2800. It goes up by 50%. What is the new price (in ₹)?
  37. 37.The price of a school bag changes from ₹1840 to ₹1104. By what percent did it come down?
  38. 38.The price of a school bag changes from ₹3220 to ₹2254. By what percent did it come down?
  39. 39.The price of a school bag changes from ₹4880 to ₹3416. By what percent did it come down?
  40. 40.A price goes up by 30% and then comes down by 5%. By what percent has it gone up in all? =

Answer key

  1. 3525
  2. 399
  3. 3582
  4. 6664
  5. 1664
  6. 4623
  7. 26.5
  8. 20
  9. 980
  10. 550
  11. 3724
  12. 40
  13. 5
  14. 2948
  15. 3956
  16. 6214
  17. 1570
  18. 90
  19. 2190
  20. 5229
  21. 55
  22. 61
  23. 65
  24. 1920
  25. 25
  26. 2268
  27. 810
  28. 4389
  29. 25
  30. 3212
  31. 5
  32. 10.5
  33. 5
  34. 1792
  35. 10
  36. 4200
  37. 40
  38. 30
  39. 30
  40. 23.5

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