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Worksheet: Finding and Using the Percent of Increase or Decrease

Q1:

Find the percentage change from $835 to $690. Round to the nearest whole percent.

Q2:

A road has 7 lanes. Determine, to the nearest whole percent, the percentage change in the number of lanes if an extra lane is added in each direction.

Q3:

Last year, 336 students enrolled in a school. This year, 430 students enrolled in the same school. Determine the percentage change to the nearest whole percent, and state whether the change is an increase or a decrease.

  • A 7 8 % , increase
  • B 2 2 % , decrease
  • C 7 2 % , decrease
  • D 2 8 % , increase
  • E 1 3 % , decrease

Q4:

Determine, to the nearest whole percent, the percentage change of 1 2 to 2 3 , and state whether the percentage change is an increase or a decrease.

  • A 2 5 % , decrease
  • B 6 7 % , increase
  • C 7 5 % , decrease
  • D 3 3 % , increase
  • E 3 3 % , decrease

Q5:

A pair of headphones costs $100 at a store. Another store sells the same pair for $159. Determine the percentage increase in the price at the second store.

Q6:

What is the percentage change of 34.4 grams to 26.6 grams? Round the answer to the nearest whole percent, and then state whether this change is an increase or a decrease.

  • A 2 9 % , increase
  • B 7 7 % , decrease
  • C 7 1 % , increase
  • D 2 3 % , decrease
  • E 2 3 % , increase

Q7:

Between 2006 and 2007, smartphone users increased from 7.7 million to 31 million. Determine, to the nearest whole percent, the percentage increase.

Q8:

A bottle of hand lotion is on sale for $5.01. If this price represents a 2 8 % discount from the original price, determine the original price to the nearest cent.

Q9:

A USB flash drive that has a regular price of $59 is on sale at a 3 6 % discount. Determine its sale price.

Q10:

A mobile app, whose regular price is $11.43, is on sale at a discount of 2 1 % . Find the sale price to the nearest cent.

Q11:

The annual video game sales for a company were $37.5 billion last year. If sales are expected to increase by 1 2 % , determine the projected amount of sales in the coming year.

Q12:

Scarlett ordered a TV set online. The set cost $1 629 in addition to a sales tax of 4 1 2 % . Determine, to the nearest cent, the total amount she paid.

Q13:

Last month, the total amount of David’s expenses was $2 650. His mortgage is due this month, so he expects his total expenses to be 1 4 0 % of the amount spent last month. Determine the amount of money David is expected to spend this month.

Q14:

The costs of two different video games decreased by $9. The original cost of the first game was $49, and the original cost of the second one was $43. Which game had the greater percent of decrease?

  • Athe second game
  • Bthe first game

Q15:

Determine, to the nearest cent, the total price of a chair that costs $14.82 after a sales tax of 5 1 4 % is added.

Q16:

Decrease 45 by 1 1 . 7 % .

Q17:

Increase 45 by 12%.

Q18:

Determine, to the nearest whole percent, the percentage change of 37.6 months to 50.9 months, and state whether the percentage change is an increase or a decrease.

  • A 2 6 % , decrease
  • B 6 5 % , increase
  • C 7 4 % , decrease
  • D 3 5 % , increase
  • E 3 5 % , decrease

Q19:

Increase 40 by 1 2 . 2 % .

Q20:

Decrease 450 by 8 1 % .

Q21:

Decrease 42 by 2 6 % .

Q22:

The headphones that David wants originally cost $277. Yesterday, they were 2 4 % off and his grandmother bought them for him because she gets an additional 1 5 % off with her senior citizen discount. David has to pay his grandmother back half the amount she spent. How much does he owe her?

Q23:

Increase 85.3 by 1 1 2 . 4 % .

Q24:

Using the given graph, determine between which two years the percent of increase in the number of trucks sold was the greatest, and give its value to the nearest whole percent.

  • Abetween 2003 and 2004, 3 9 %
  • Bbetween 2004 and 2005, 8 5 %
  • Cbetween 2003 and 2004, 1 3 %
  • Dbetween 2004 and 2005, 1 7 %
  • Ebetween 2004 and 2005, 1 5 %

Q25:

When Mason was 9 years old, he was 49 inches tall. He is now 12 years old and 56 inches tall. Determine, to the nearest tenth, the percentage increase in his height.