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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 579 · 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 800 litres. 15% of the water is used. How many litres are left?
  2. 2.A water tank holds 2420 litres. 10% of the water is used. How many litres are left?
  3. 3.A town has 3940 people. Its population grows by 25%. How many people live there now?
  4. 4.A water tank holds 420 litres. 50% of the water is used. How many litres are left?
  5. 5.A water tank holds 740 litres. 10% of the water is used. How many litres are left?
  6. 6.The price of a school bag changes from ₹3080 to ₹3542. By what percent did it go up?
  7. 7.The price of a school bag changes from ₹1280 to ₹1024. By what percent did it come down?
  8. 8.A town has 4660 people. Its population grows by 40%. How many people live there now?
  9. 9.A shop sells 1080 cups of tea a month. Next month it sells 30% more. How many cups does it sell next month?
  10. 10.The price of a school bag changes from ₹4720 to ₹4956. By what percent did it go up?
  11. 11.The price of a school bag changes from ₹2980 to ₹4172. By what percent did it go up?
  12. 12.A water tank holds 620 litres. 40% of the water is used. How many litres are left?
  13. 13.A water tank holds 2720 litres. 5% of the water is used. How many litres are left?
  14. 14.A water tank holds 1240 litres. 20% of the water is used. How many litres are left?
  15. 15.The price of a school bag changes from ₹100 to ₹115. By what percent did it go up?
  16. 16.The price of a bicycle is ₹2480. It goes up by 10%. What is the new price (in ₹)?
  17. 17.A town has 2880 people. Its population grows by 20%. How many people live there now?
  18. 18.A water tank holds 2100 litres. 40% of the water is used. How many litres are left?
  19. 19.A price comes down by 10% and then comes down by 40% more. By what percent has it come down in all? =
  20. 20.A water tank holds 460 litres. 20% of the water is used. How many litres are left?
  21. 21.A price comes down by 10% and then comes down by 30% more. By what percent has it come down in all? =
  22. 22.A shop sells 2600 cups of tea a month. Next month it sells 25% more. How many cups does it sell next month?
  23. 23.The price of a school bag changes from ₹180 to ₹189. By what percent did it go up?
  24. 24.A price comes down by 15% and then comes down by 5% more. By what percent has it come down in all? =
  25. 25.A price goes up by 30% and then comes down by 5%. By what percent has it gone up in all? =
  26. 26.A price goes up by 50% and then comes down by 10%. By what percent has it gone up in all? =
  27. 27.The price of a school bag changes from ₹860 to ₹774. By what percent did it come down?
  28. 28.A town has 1540 people. Its population grows by 25%. How many people live there now?
  29. 29.A water tank holds 3260 litres. 40% of the water is used. How many litres are left?
  30. 30.A town has 1380 people. Its population grows by 10%. How many people live there now?
  31. 31.A water tank holds 2300 litres. 5% of the water is used. How many litres are left?
  32. 32.A town has 980 people. Its population grows by 30%. How many people live there now?
  33. 33.A price comes down by 40% and then comes down by 5% more. By what percent has it come down in all? =
  34. 34.A shop sells 1060 cups of tea a month. Next month it sells 5% more. How many cups does it sell next month?
  35. 35.A water tank holds 4600 litres. 15% of the water is used. How many litres are left?
  36. 36.A water tank holds 2040 litres. 20% of the water is used. How many litres are left?
  37. 37.A water tank holds 540 litres. 40% of the water is used. How many litres are left?
  38. 38.A price goes up by 10% and then goes up by 20% more. By what percent has it gone up in all? =
  39. 39.The price of a bicycle is ₹3280. It goes up by 20%. What is the new price (in ₹)?
  40. 40.The price of a school bag changes from ₹2780 to ₹4170. By what percent did it go up?

Answer key

  1. 680
  2. 2178
  3. 4925
  4. 210
  5. 666
  6. 15
  7. 20
  8. 6524
  9. 1404
  10. 5
  11. 40
  12. 372
  13. 2584
  14. 992
  15. 15
  16. 2728
  17. 3456
  18. 1260
  19. 46
  20. 368
  21. 37
  22. 3250
  23. 5
  24. 19.25
  25. 23.5
  26. 35
  27. 10
  28. 1925
  29. 1956
  30. 1518
  31. 2185
  32. 1274
  33. 43
  34. 1113
  35. 3910
  36. 1632
  37. 324
  38. 32
  39. 3936
  40. 50

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