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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 183 · 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 water tank holds 3640 litres. 20% of the water is used. How many litres are left?
  2. 2.A town has 3520 people. Its population grows by 20%. How many people live there now?
  3. 3.A town has 4840 people. Its population grows by 5%. How many people live there now?
  4. 4.The price of a school bag changes from ₹2220 to ₹1776. By what percent did it come down?
  5. 5.A town has 4140 people. Its population grows by 50%. How many people live there now?
  6. 6.The price of a school bag changes from ₹4220 to ₹4642. By what percent did it go up?
  7. 7.A water tank holds 1440 litres. 30% of the water is used. How many litres are left?
  8. 8.A town has 2820 people. Its population grows by 40%. How many people live there now?
  9. 9.A water tank holds 3300 litres. 25% of the water is used. How many litres are left?
  10. 10.A price goes up by 10% and then goes up by 25% more. By what percent has it gone up in all? =
  11. 11.A price goes up by 30% and then goes up by 15% more. By what percent has it gone up in all? =
  12. 12.A price goes up by 25% and then comes down by 15%. By what percent has it gone up in all? =
  13. 13.The price of a school bag changes from ₹120 to ₹180. By what percent did it go up?
  14. 14.The price of a school bag changes from ₹4760 to ₹6664. By what percent did it go up?
  15. 15.A price goes up by 30% and then goes up by 30% more. By what percent has it gone up in all? =
  16. 16.A price goes up by 5% and then goes up by 50% more. By what percent has it gone up in all? =
  17. 17.The price of a school bag changes from ₹3660 to ₹5124. By what percent did it go up?
  18. 18.The price of a bicycle is ₹2680. It goes up by 5%. What is the new price (in ₹)?
  19. 19.A town has 2260 people. Its population grows by 30%. How many people live there now?
  20. 20.The price of a school bag changes from ₹1700 to ₹1870. By what percent did it go up?
  21. 21.A town has 3200 people. Its population grows by 20%. How many people live there now?
  22. 22.The price of a school bag changes from ₹4140 to ₹3519. By what percent did it come down?
  23. 23.The price of a bicycle is ₹2840. It goes up by 30%. What is the new price (in ₹)?
  24. 24.The price of a school bag changes from ₹1920 to ₹2688. By what percent did it go up?
  25. 25.A price comes down by 20% and then comes down by 20% more. By what percent has it come down in all? =
  26. 26.The price of a school bag changes from ₹2000 to ₹1800. By what percent did it come down?
  27. 27.A water tank holds 720 litres. 25% of the water is used. How many litres are left?
  28. 28.A price goes up by 50% and then comes down by 15%. By what percent has it gone up in all? =
  29. 29.The price of a school bag changes from ₹2080 to ₹1560. By what percent did it come down?
  30. 30.The price of a school bag changes from ₹4560 to ₹3192. By what percent did it come down?
  31. 31.A town has 4700 people. Its population grows by 10%. How many people live there now?
  32. 32.A water tank holds 700 litres. 50% of the water is used. How many litres are left?
  33. 33.The price of a bicycle is ₹400. It goes up by 20%. What is the new price (in ₹)?
  34. 34.The price of a bicycle is ₹1180. It goes up by 5%. What is the new price (in ₹)?
  35. 35.A town has 680 people. Its population grows by 30%. How many people live there now?
  36. 36.The price of a school bag changes from ₹1240 to ₹1364. By what percent did it go up?
  37. 37.A shop sells 3080 cups of tea a month. Next month it sells 10% more. How many cups does it sell next month?
  38. 38.A price comes down by 25% and then comes down by 20% more. By what percent has it come down in all? =
  39. 39.A price goes up by 20% and then goes up by 5% more. By what percent has it gone up in all? =
  40. 40.A shop sells 3260 cups of tea a month. Next month it sells 40% more. How many cups does it sell next month?

Answer key

  1. 2912
  2. 4224
  3. 5082
  4. 20
  5. 6210
  6. 10
  7. 1008
  8. 3948
  9. 2475
  10. 37.5
  11. 49.5
  12. 6.25
  13. 50
  14. 40
  15. 69
  16. 57.5
  17. 40
  18. 2814
  19. 2938
  20. 10
  21. 3840
  22. 15
  23. 3692
  24. 40
  25. 36
  26. 10
  27. 540
  28. 27.5
  29. 25
  30. 30
  31. 5170
  32. 350
  33. 480
  34. 1239
  35. 884
  36. 10
  37. 3388
  38. 40
  39. 26
  40. 4564

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