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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 520 · 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 2580 people. Its population grows by 20%. How many people live there now?
  2. 2.A water tank holds 4480 litres. 10% of the water is used. How many litres are left?
  3. 3.A price goes up by 50% and then goes up by 40% more. By what percent has it gone up in all? =
  4. 4.A price goes up by 20% and then goes up by 5% more. By what percent has it gone up in all? =
  5. 5.A water tank holds 80 litres. 40% of the water is used. How many litres are left?
  6. 6.A water tank holds 3020 litres. 20% of the water is used. How many litres are left?
  7. 7.The price of a bicycle is ₹560. It goes up by 10%. What is the new price (in ₹)?
  8. 8.The price of a bicycle is ₹2640. It goes up by 15%. What is the new price (in ₹)?
  9. 9.A water tank holds 2380 litres. 30% of the water is used. How many litres are left?
  10. 10.The price of a school bag changes from ₹1640 to ₹2460. By what percent did it go up?
  11. 11.A price goes up by 50% and then comes down by 25%. By what percent has it gone up in all? =
  12. 12.A shop sells 460 cups of tea a month. Next month it sells 5% more. How many cups does it sell next month?
  13. 13.A price comes down by 40% and then comes down by 20% more. By what percent has it come down in all? =
  14. 14.A price comes down by 30% and then comes down by 15% more. By what percent has it come down in all? =
  15. 15.A water tank holds 200 litres. 50% of the water is used. How many litres are left?
  16. 16.A price comes down by 30% and then comes down by 30% more. By what percent has it come down in all? =
  17. 17.A shop sells 4580 cups of tea a month. Next month it sells 20% more. How many cups does it sell next month?
  18. 18.The price of a bicycle is ₹2180. It goes up by 40%. What is the new price (in ₹)?
  19. 19.A price comes down by 15% and then comes down by 30% more. By what percent has it come down in all? =
  20. 20.A shop sells 4980 cups of tea a month. Next month it sells 10% more. How many cups does it sell next month?
  21. 21.The price of a school bag changes from ₹520 to ₹676. By what percent did it go up?
  22. 22.The price of a school bag changes from ₹5000 to ₹6250. By what percent did it go up?
  23. 23.The price of a school bag changes from ₹4240 to ₹2968. By what percent did it come down?
  24. 24.A town has 2220 people. Its population grows by 20%. How many people live there now?
  25. 25.The price of a school bag changes from ₹560 to ₹504. By what percent did it come down?
  26. 26.The price of a bicycle is ₹680. It goes up by 5%. What is the new price (in ₹)?
  27. 27.A price comes down by 20% and then comes down by 20% more. By what percent has it come down in all? =
  28. 28.A water tank holds 4100 litres. 10% of the water is used. How many litres are left?
  29. 29.A price comes down by 30% and then comes down by 5% more. By what percent has it come down in all? =
  30. 30.A town has 1700 people. Its population grows by 5%. How many people live there now?
  31. 31.The price of a school bag changes from ₹4240 to ₹2120. By what percent did it come down?
  32. 32.A price goes up by 40% and then comes down by 15%. By what percent has it gone up in all? =
  33. 33.The price of a bicycle is ₹4420. It goes up by 5%. What is the new price (in ₹)?
  34. 34.A shop sells 4800 cups of tea a month. Next month it sells 5% more. How many cups does it sell next month?
  35. 35.The price of a school bag changes from ₹3920 to ₹5880. By what percent did it go up?
  36. 36.A town has 2120 people. Its population grows by 20%. How many people live there now?
  37. 37.A price goes up by 25% and then goes up by 25% more. By what percent has it gone up in all? =
  38. 38.A price goes up by 25% and then goes up by 30% more. By what percent has it gone up in all? =
  39. 39.A water tank holds 2560 litres. 40% of the water is used. How many litres are left?
  40. 40.The price of a school bag changes from ₹3020 to ₹3171. By what percent did it go up?

Answer key

  1. 3096
  2. 4032
  3. 110
  4. 26
  5. 48
  6. 2416
  7. 616
  8. 3036
  9. 1666
  10. 50
  11. 12.5
  12. 483
  13. 52
  14. 40.5
  15. 100
  16. 51
  17. 5496
  18. 3052
  19. 40.5
  20. 5478
  21. 30
  22. 25
  23. 30
  24. 2664
  25. 10
  26. 714
  27. 36
  28. 3690
  29. 33.5
  30. 1785
  31. 50
  32. 19
  33. 4641
  34. 5040
  35. 50
  36. 2544
  37. 56.25
  38. 62.5
  39. 1536
  40. 5

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