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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 373 · 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 1660 litres. 20% of the water is used. How many litres are left?
  2. 2.A water tank holds 1880 litres. 20% of the water is used. How many litres are left?
  3. 3.A price comes down by 20% and then comes down by 10% more. By what percent has it come down in all? =
  4. 4.A price goes up by 5% and then goes up by 20% more. By what percent has it gone up in all? =
  5. 5.A town has 3320 people. Its population grows by 15%. How many people live there now?
  6. 6.The price of a school bag changes from ₹3720 to ₹1860. By what percent did it come down?
  7. 7.The price of a school bag changes from ₹140 to ₹105. By what percent did it come down?
  8. 8.The price of a school bag changes from ₹1120 to ₹1232. By what percent did it go up?
  9. 9.A price goes up by 15% and then goes up by 20% more. By what percent has it gone up in all? =
  10. 10.A shop sells 1360 cups of tea a month. Next month it sells 30% more. How many cups does it sell next month?
  11. 11.The price of a school bag changes from ₹600 to ₹570. By what percent did it come down?
  12. 12.A price goes up by 20% and then goes up by 20% more. By what percent has it gone up in all? =
  13. 13.The price of a school bag changes from ₹1020 to ₹1530. By what percent did it go up?
  14. 14.The price of a school bag changes from ₹2860 to ₹2717. By what percent did it come down?
  15. 15.A price goes up by 20% and then comes down by 10%. By what percent has it gone up in all? =
  16. 16.A water tank holds 80 litres. 25% of the water is used. How many litres are left?
  17. 17.The price of a school bag changes from ₹4120 to ₹4944. By what percent did it go up?
  18. 18.The price of a school bag changes from ₹1800 to ₹1620. By what percent did it come down?
  19. 19.The price of a school bag changes from ₹4360 to ₹5014. By what percent did it go up?
  20. 20.The price of a school bag changes from ₹3100 to ₹3875. By what percent did it go up?
  21. 21.A price goes up by 20% and then goes up by 30% more. By what percent has it gone up in all? =
  22. 22.A water tank holds 920 litres. 10% of the water is used. How many litres are left?
  23. 23.The price of a bicycle is ₹2180. It goes up by 15%. What is the new price (in ₹)?
  24. 24.A shop sells 1700 cups of tea a month. Next month it sells 50% more. How many cups does it sell next month?
  25. 25.A water tank holds 3900 litres. 40% of the water is used. How many litres are left?
  26. 26.A town has 2100 people. Its population grows by 25%. How many people live there now?
  27. 27.A town has 2340 people. Its population grows by 40%. How many people live there now?
  28. 28.The price of a school bag changes from ₹940 to ₹1410. By what percent did it go up?
  29. 29.A water tank holds 1520 litres. 5% of the water is used. How many litres are left?
  30. 30.The price of a school bag changes from ₹4320 to ₹3888. By what percent did it come down?
  31. 31.A town has 3720 people. Its population grows by 30%. How many people live there now?
  32. 32.A water tank holds 2900 litres. 50% of the water is used. How many litres are left?
  33. 33.A town has 3820 people. Its population grows by 10%. How many people live there now?
  34. 34.A price goes up by 20% and then goes up by 40% more. By what percent has it gone up in all? =
  35. 35.A price goes up by 10% and then goes up by 15% more. By what percent has it gone up in all? =
  36. 36.A town has 4720 people. Its population grows by 15%. How many people live there now?
  37. 37.The price of a school bag changes from ₹1840 to ₹1104. By what percent did it come down?
  38. 38.The price of a school bag changes from ₹3940 to ₹1970. By what percent did it come down?
  39. 39.A water tank holds 2920 litres. 20% of the water is used. How many litres are left?
  40. 40.A town has 1000 people. Its population grows by 25%. How many people live there now?

Answer key

  1. 1328
  2. 1504
  3. 28
  4. 26
  5. 3818
  6. 50
  7. 25
  8. 10
  9. 38
  10. 1768
  11. 5
  12. 44
  13. 50
  14. 5
  15. 8
  16. 60
  17. 20
  18. 10
  19. 15
  20. 25
  21. 56
  22. 828
  23. 2507
  24. 2550
  25. 2340
  26. 2625
  27. 3276
  28. 50
  29. 1444
  30. 10
  31. 4836
  32. 1450
  33. 4202
  34. 68
  35. 26.5
  36. 5428
  37. 40
  38. 50
  39. 2336
  40. 1250

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