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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 625 · 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 1780 people. Its population grows by 5%. How many people live there now?
  2. 2.A water tank holds 2140 litres. 5% of the water is used. How many litres are left?
  3. 3.The price of a school bag changes from ₹3620 to ₹3439. By what percent did it come down?
  4. 4.The price of a school bag changes from ₹4360 to ₹3488. By what percent did it come down?
  5. 5.A price goes up by 5% and then goes up by 10% more. By what percent has it gone up in all? =
  6. 6.The price of a school bag changes from ₹1060 to ₹1590. By what percent did it go up?
  7. 7.A price comes down by 25% and then comes down by 50% more. By what percent has it come down in all? =
  8. 8.A water tank holds 1020 litres. 10% of the water is used. How many litres are left?
  9. 9.A shop sells 160 cups of tea a month. Next month it sells 10% more. How many cups does it sell next month?
  10. 10.A price comes down by 15% and then comes down by 20% more. By what percent has it come down in all? =
  11. 11.A price comes down by 40% and then comes down by 40% more. By what percent has it come down in all? =
  12. 12.A price goes up by 15% and then goes up by 10% more. By what percent has it gone up in all? =
  13. 13.The price of a school bag changes from ₹3400 to ₹2720. By what percent did it come down?
  14. 14.A water tank holds 3020 litres. 25% of the water is used. How many litres are left?
  15. 15.A water tank holds 4540 litres. 5% of the water is used. How many litres are left?
  16. 16.A water tank holds 600 litres. 5% of the water is used. How many litres are left?
  17. 17.A water tank holds 1100 litres. 50% of the water is used. How many litres are left?
  18. 18.A town has 1540 people. Its population grows by 10%. How many people live there now?
  19. 19.A water tank holds 4160 litres. 20% of the water is used. How many litres are left?
  20. 20.The price of a school bag changes from ₹580 to ₹406. By what percent did it come down?
  21. 21.A price comes down by 10% and then comes down by 40% more. By what percent has it come down in all? =
  22. 22.A town has 2620 people. Its population grows by 20%. How many people live there now?
  23. 23.A water tank holds 4180 litres. 15% of the water is used. How many litres are left?
  24. 24.A water tank holds 3280 litres. 10% of the water is used. How many litres are left?
  25. 25.A shop sells 1980 cups of tea a month. Next month it sells 40% more. How many cups does it sell next month?
  26. 26.A water tank holds 1860 litres. 15% of the water is used. How many litres are left?
  27. 27.A shop sells 2800 cups of tea a month. Next month it sells 30% more. How many cups does it sell next month?
  28. 28.The price of a school bag changes from ₹2940 to ₹2058. By what percent did it come down?
  29. 29.The price of a school bag changes from ₹4360 to ₹2616. By what percent did it come down?
  30. 30.The price of a school bag changes from ₹2460 to ₹2706. By what percent did it go up?
  31. 31.A town has 4960 people. Its population grows by 25%. How many people live there now?
  32. 32.The price of a bicycle is ₹3800. It goes up by 20%. What is the new price (in ₹)?
  33. 33.A shop sells 4860 cups of tea a month. Next month it sells 50% more. How many cups does it sell next month?
  34. 34.The price of a school bag changes from ₹1420 to ₹1491. By what percent did it go up?
  35. 35.A price goes up by 10% and then goes up by 10% more. By what percent has it gone up in all? =
  36. 36.A price comes down by 30% and then comes down by 10% more. By what percent has it come down in all? =
  37. 37.A water tank holds 2000 litres. 50% of the water is used. How many litres are left?
  38. 38.A water tank holds 1400 litres. 15% of the water is used. How many litres are left?
  39. 39.A price goes up by 40% and then goes up by 5% more. By what percent has it gone up in all? =
  40. 40.A price goes up by 15% and then goes up by 5% more. By what percent has it gone up in all? =

Answer key

  1. 1869
  2. 2033
  3. 5
  4. 20
  5. 15.5
  6. 50
  7. 62.5
  8. 918
  9. 176
  10. 32
  11. 64
  12. 26.5
  13. 20
  14. 2265
  15. 4313
  16. 570
  17. 550
  18. 1694
  19. 3328
  20. 30
  21. 46
  22. 3144
  23. 3553
  24. 2952
  25. 2772
  26. 1581
  27. 3640
  28. 30
  29. 40
  30. 10
  31. 6200
  32. 4560
  33. 7290
  34. 5
  35. 21
  36. 37
  37. 1000
  38. 1190
  39. 47
  40. 20.75

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