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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 340 · 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.

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  1. 1.A price goes up by 10% and then comes down by 5%. By what percent has it gone up in all? =
  2. 2.The price of a school bag changes from ₹80 to ₹64. By what percent did it come down?
  3. 3.The price of a school bag changes from ₹2840 to ₹3692. By what percent did it go up?
  4. 4.A town has 3260 people. Its population grows by 20%. How many people live there now?
  5. 5.The price of a bicycle is ₹2220. It goes up by 30%. What is the new price (in ₹)?
  6. 6.A town has 3100 people. Its population grows by 10%. How many people live there now?
  7. 7.The price of a school bag changes from ₹2620 to ₹2227. By what percent did it come down?
  8. 8.A price comes down by 20% and then comes down by 20% more. By what percent has it come down in all? =
  9. 9.A town has 1260 people. Its population grows by 10%. How many people live there now?
  10. 10.The price of a school bag changes from ₹3800 to ₹4560. By what percent did it go up?
  11. 11.A town has 400 people. Its population grows by 25%. How many people live there now?
  12. 12.A shop sells 3380 cups of tea a month. Next month it sells 25% more. How many cups does it sell next month?
  13. 13.The price of a school bag changes from ₹1600 to ₹1920. By what percent did it go up?
  14. 14.A price goes up by 40% and then goes up by 15% more. By what percent has it gone up in all? =
  15. 15.A shop sells 2780 cups of tea a month. Next month it sells 5% more. How many cups does it sell next month?
  16. 16.The price of a school bag changes from ₹1140 to ₹1368. By what percent did it go up?
  17. 17.The price of a bicycle is ₹480. It goes up by 5%. What is the new price (in ₹)?
  18. 18.The price of a school bag changes from ₹80 to ₹88. By what percent did it go up?
  19. 19.A price comes down by 15% and then comes down by 15% more. By what percent has it come down in all? =
  20. 20.A price goes up by 40% and then goes up by 20% more. By what percent has it gone up in all? =
  21. 21.A water tank holds 1840 litres. 15% of the water is used. How many litres are left?
  22. 22.The price of a school bag changes from ₹1000 to ₹1300. By what percent did it go up?
  23. 23.A price goes up by 10% and then goes up by 10% more. By what percent has it gone up in all? =
  24. 24.A price comes down by 10% and then comes down by 15% more. By what percent has it come down in all? =
  25. 25.A water tank holds 4460 litres. 30% of the water is used. How many litres are left?
  26. 26.A shop sells 3040 cups of tea a month. Next month it sells 40% more. How many cups does it sell next month?
  27. 27.The price of a bicycle is ₹1820. It goes up by 10%. What is the new price (in ₹)?
  28. 28.A water tank holds 1640 litres. 25% of the water is used. How many litres are left?
  29. 29.A water tank holds 4260 litres. 15% of the water is used. How many litres are left?
  30. 30.A price goes up by 50% and then comes down by 25%. By what percent has it gone up in all? =
  31. 31.The price of a bicycle is ₹580. It goes up by 40%. What is the new price (in ₹)?
  32. 32.A price goes up by 10% and then goes up by 25% more. By what percent has it gone up in all? =
  33. 33.A water tank holds 320 litres. 20% of the water is used. How many litres are left?
  34. 34.A price comes down by 30% and then comes down by 40% more. By what percent has it come down in all? =
  35. 35.The price of a bicycle is ₹3420. It goes up by 5%. What is the new price (in ₹)?
  36. 36.A price comes down by 20% and then comes down by 25% more. By what percent has it come down in all? =
  37. 37.A price goes up by 30% and then goes up by 40% more. By what percent has it gone up in all? =
  38. 38.The price of a school bag changes from ₹3740 to ₹4862. By what percent did it go up?
  39. 39.A water tank holds 400 litres. 40% of the water is used. How many litres are left?
  40. 40.A water tank holds 240 litres. 20% of the water is used. How many litres are left?

Answer key

  1. 4.5
  2. 20
  3. 30
  4. 3912
  5. 2886
  6. 3410
  7. 15
  8. 36
  9. 1386
  10. 20
  11. 500
  12. 4225
  13. 20
  14. 61
  15. 2919
  16. 20
  17. 504
  18. 10
  19. 27.75
  20. 68
  21. 1564
  22. 30
  23. 21
  24. 23.5
  25. 3122
  26. 4256
  27. 2002
  28. 1230
  29. 3621
  30. 12.5
  31. 812
  32. 37.5
  33. 256
  34. 58
  35. 3591
  36. 40
  37. 82
  38. 30
  39. 240
  40. 192

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