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10th Grade Percentage Increase and Decrease Worksheet — Level 3 — Practice Set 4 — Answers

Answer sheet with worked solutions for the 10th Grade percentages worksheet.

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Success TutoringWorksheetsAnswer sheet10th Grade · Mathematics · Percentages

10th Grade Percentage Increase and Decrease Worksheet — Level 3 — Practice Set 4 — Answers

Percentage change = change ÷ original amount × 100. Always divide by the original amount.

1.After a 30% increase, a price is $962. What was the original price?

Answer: $740

  1. New price = 130% of the original
  2. Original = 962 ÷ 1.3
  3. = $740
2.After a 75% decrease, a price is $165. What was the original price?

Answer: $660

  1. New price = 25% of the original
  2. Original = 165 ÷ 0.25
  3. = $660
3.After a 75% decrease, a price is $20. What was the original price?

Answer: $80

  1. New price = 25% of the original
  2. Original = 20 ÷ 0.25
  3. = $80
4.After a 40% decrease, a price is $120. What was the original price?

Answer: $200

  1. New price = 60% of the original
  2. Original = 120 ÷ 0.6
  3. = $200
5.After a 75% decrease, a price is $95. What was the original price?

Answer: $380

  1. New price = 25% of the original
  2. Original = 95 ÷ 0.25
  3. = $380
6.After a 15% increase, a price is $690. What was the original price?

Answer: $600

  1. New price = 115% of the original
  2. Original = 690 ÷ 1.15
  3. = $600
7.After a 40% increase, a price is $532. What was the original price?

Answer: $380

  1. New price = 140% of the original
  2. Original = 532 ÷ 1.4
  3. = $380
8.After a 60% decrease, a price is $216. What was the original price?

Answer: $540

  1. New price = 40% of the original
  2. Original = 216 ÷ 0.4
  3. = $540
9.A price changes from $600 to $660. Find the percentage increase.

Answer: 10%

  1. Change = 660 − 600 = 60
  2. 60 ÷ 600 × 100 = 10%
10.A price changes from $300 to $480. Find the percentage increase.

Answer: 60%

  1. Change = 480 − 300 = 180
  2. 180 ÷ 300 × 100 = 60%
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