Percent of Change

Percent of Change

Percent of change Formula

(New - Old) ÷ Old x 100

REMEMBER:

If your answer is negative, it is a percent decrease.

If your answer is positive, it is a percent increase.

Multiple Choice

1.) Carlos took a test and made a 50. On the next test, he made a 75. What was the percent of change between the two test scores?

• 50% increase

• 50% decrease

• 25% increase

• 25% decrease

Answer

(N - O) ÷ O x 100
(75 - 50) ÷ 50 x 100 = 50
Answer: 50% increase

Multiple Choice

2.) Bob got a raise, and his hourly wage increased from $12 to $15. What is the percent of change?

• 25% decrease

• 25% increase

• 20% decrease

• 20% increase

Answer

(N - O) ÷ O x 100

(15 - 12) ÷ 12 x 100 = 25

Answer: 25% increase

Multiple Choice

3.) The price of a pair of shoes increases from $20 to $32. What is the percent the price of the shoes changed?

• 37.5% increase

• 37.5% decrease

• 60% increase

• 60% decrease

Answer

(N - O) ÷ O x 100

(32 - 20) ÷ 20 x 100 = 60

Answer: 60% increase

Multiple Choice

4.) At a coffee shop, the price of a cup of coffee increased from $1.20 to $1.44. What is the percent of change in the cost of the coffee?

• 16.66% increase

• 16.66% decrease

• 20% decrease

• 20% increase

Answer

(N - O) ÷ O x 100

(1.44 - 1.20) ÷ 1.20 x 100= 20

Answer: 20% increase

Multiple Choice

5.) In a class, the number of students has been decreased from 27 to 18. Find the percent of change.

• 33.33% decrease

• 33.33% increase

• 50% decrease

• 50% increase

Answer

(N - O) ÷ O x 100

(18 - 27) ÷ 27 x 100= -33.33

Answer: 33.33% decrease

Multiple Choice

6.) The price of gasoline dropped from $2.40 to $2.24 in one month. By what percent did the gas price change ?

• 6.67% increase

• 6.67% decrease

• 7.14% increase

• 7.14% decrease

Answer

(N - O) ÷ O x 100

(2.24 - 2.40) ÷ 2.40 x 100= -6.67

Answer: 6.67% decrease

Multiple Choice

7.) The World Future Society predicts that by the year 2025, airplanes will be able to carry 1400 passengers. Today’s biggest jets can carry 600 passengers. What will be the percent of change in the number of airplane passengers?

• 57.14% increase

• 57.14% decrease

• 133.33% increase

• 133.33% decrease

Answer

(N - O) ÷ O x 100

(1400 - 600) ÷ 600 x 100=133.33

Answer: 133.33% increase

Multiple Choice

8.) As soon as a new car is purchased and driven away from the dealership, it begins to lose its value, or depreciate. Alonso bought a 2004 Plymouth Neon for $9559. One year later, the value of the car was $8500. What was the percent of change of the value of the car?

• 11.08% decrease

• 11.08% increase

• 12.46% decrease

• 12.46% increase

Answer

(N - O) ÷ O x 100

(8500 - 9559) ÷ 9559 x 100= -11.08

Answer: 11.08% decrease