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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 704 · 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 2900 people. Its population grows by 5%. How many people live there now?
  2. 2.A shop sells 1420 cups of tea a month. Next month it sells 20% more. How many cups does it sell next month?
  3. 3.A water tank holds 4680 litres. 5% of the water is used. How many litres are left?
  4. 4.A town has 4400 people. Its population grows by 40%. How many people live there now?
  5. 5.The price of a school bag changes from ₹2460 to ₹2706. By what percent did it go up?
  6. 6.A water tank holds 3540 litres. 25% of the water is used. How many litres are left?
  7. 7.A shop sells 260 cups of tea a month. Next month it sells 20% more. How many cups does it sell next month?
  8. 8.A water tank holds 160 litres. 40% of the water is used. How many litres are left?
  9. 9.A shop sells 3420 cups of tea a month. Next month it sells 25% more. How many cups does it sell next month?
  10. 10.The price of a bicycle is ₹1420. It goes up by 30%. What is the new price (in ₹)?
  11. 11.The price of a bicycle is ₹1300. It goes up by 5%. What is the new price (in ₹)?
  12. 12.A town has 1500 people. Its population grows by 30%. How many people live there now?
  13. 13.The price of a school bag changes from ₹360 to ₹396. By what percent did it go up?
  14. 14.A price goes up by 10% and then goes up by 40% more. By what percent has it gone up in all? =
  15. 15.The price of a bicycle is ₹4520. It goes up by 15%. What is the new price (in ₹)?
  16. 16.A shop sells 400 cups of tea a month. Next month it sells 25% more. How many cups does it sell next month?
  17. 17.The price of a school bag changes from ₹480 to ₹432. By what percent did it come down?
  18. 18.A price goes up by 15% and then goes up by 40% more. By what percent has it gone up in all? =
  19. 19.The price of a school bag changes from ₹2600 to ₹1300. By what percent did it come down?
  20. 20.A price goes up by 40% and then comes down by 25%. By what percent has it gone up in all? =
  21. 21.A town has 1920 people. Its population grows by 40%. How many people live there now?
  22. 22.A water tank holds 2400 litres. 30% of the water is used. How many litres are left?
  23. 23.A water tank holds 4880 litres. 15% of the water is used. How many litres are left?
  24. 24.A town has 1200 people. Its population grows by 10%. How many people live there now?
  25. 25.The price of a school bag changes from ₹2520 to ₹2142. By what percent did it come down?
  26. 26.The price of a school bag changes from ₹3060 to ₹3213. By what percent did it go up?
  27. 27.A water tank holds 1880 litres. 15% of the water is used. How many litres are left?
  28. 28.A price goes up by 15% and then goes up by 20% more. By what percent has it gone up in all? =
  29. 29.A water tank holds 2500 litres. 25% of the water is used. How many litres are left?
  30. 30.A water tank holds 700 litres. 10% of the water is used. How many litres are left?
  31. 31.A town has 3940 people. Its population grows by 25%. How many people live there now?
  32. 32.A price comes down by 15% and then comes down by 5% more. By what percent has it come down in all? =
  33. 33.A water tank holds 4100 litres. 5% of the water is used. How many litres are left?
  34. 34.A water tank holds 160 litres. 10% of the water is used. How many litres are left?
  35. 35.A water tank holds 760 litres. 20% of the water is used. How many litres are left?
  36. 36.A town has 2120 people. Its population grows by 50%. How many people live there now?
  37. 37.A price goes up by 5% and then goes up by 20% more. By what percent has it gone up in all? =
  38. 38.The price of a bicycle is ₹60. It goes up by 30%. What is the new price (in ₹)?
  39. 39.A price comes down by 10% and then comes down by 10% more. By what percent has it come down in all? =
  40. 40.A price goes up by 25% and then goes up by 25% more. By what percent has it gone up in all? =

Answer key

  1. 3045
  2. 1704
  3. 4446
  4. 6160
  5. 10
  6. 2655
  7. 312
  8. 96
  9. 4275
  10. 1846
  11. 1365
  12. 1950
  13. 10
  14. 54
  15. 5198
  16. 500
  17. 10
  18. 61
  19. 50
  20. 5
  21. 2688
  22. 1680
  23. 4148
  24. 1320
  25. 15
  26. 5
  27. 1598
  28. 38
  29. 1875
  30. 630
  31. 4925
  32. 19.25
  33. 3895
  34. 144
  35. 608
  36. 3180
  37. 26
  38. 78
  39. 19
  40. 56.25

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