Proportion and Percents

Write an equation for:
Thirty-three is what percent of 100?

• 33x = 100

• .33(100) = x

• 33 = x(100)

Write the ratio as a percent and then as a decimal:
18/4

• 450%, 4.5

• 450%, 450

• 22%, .22

• .22%, 22

Find p if I = 45, r = 6%, t = 0.5

• 15

• 1500

• 150

• 1.35

Solve the percent proportion: 8 is 40% of what number?

• 15

• 20

• 25

• 10

Calculate the percent increase if a price increases from $50 to $70.

• 40%

• 30%

• 60%

• 50%

Solve the percent proportion: 15 is what percent of 75?

• 25%

• 30%

• 40%

• 20%

A shirt originally costs $40, but it is now on sale for $32. What is the percent decrease?

• 20%

• 30%

• 25%

• 15%

A car is sold for $12,000, which is 80% of its original price. What was the original price?

• $16,000

• $14,000

• $10,000

• $15,000

If a store sells a product for $80, and the markup is 25%, what is the cost price of the product?

• $60

• $70

• $64

• $75

The population of a city was 500,000 last year. This year, it increased to 550,000. What is the percent increase in population?

• 5%

• 15%

• 20%

• 10%