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In this lesson, we will learn how to find percents of change and identify them as either a percent of increase or a percent of decrease.

Q1:

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.

Q2:

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

Q3:

A book club had 60 members last year. This year, it has 48 members. Determine the percentage decrease in the number of club members.

Q4:

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.

Q5:

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.

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.

Q7:

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.

Q8:

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

Q9:

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?

Q10:

Of the 200 students that graduated from a school in a given year, 166 attended the graduation ceremony. Determine the percentage of students that attended the graduation ceremony.

Q11:

One year, Ramy read 20 books. The next year, he read 27 books, determine the percentage increase in the number of books Ramy read.

Q12:

Engy is researching the value of her LED TV. If its value decreased from $4 200 to $3 822, determine the percentage decrease.

Q13:

Ramy used 75 g of a chocolate containing 80% cocoa and 100 g of another type of chocolate containing 65% cocoa. He mixed the chocolate with 150 g of butter, 250 g of flour, 150 g of sugar, and 2 eggs weighing 50 g each. What is the percent of cocoa in his chocolate cake before he bakes it? Give your answer correct to one decimal place if necessary.

Q14:

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

Q15:

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.

Q16:

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.

Q17:

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.

Q18:

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

Q19:

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

Q20:

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.

Q21:

Decrease 45 by 1 1 . 7 % .

Q22:

Increase 45 by 12%.

Q23:

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.

Q24:

Increase 40 by 1 2 . 2 % .

Q25:

Decrease 450 by 8 1 % .

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