Percent Change Review

Front

What is percent change?

Back

Percent change is a way to express a change in a quantity as a percentage of the original amount. It is calculated using the formula: ((New Value - Original Value) / Original Value) x 100.

Front

How do you calculate the sale price after a discount?

Back

To calculate the sale price after a discount, subtract the discount amount from the original price. Discount Amount = Original Price x (Discount Percentage / 100). Sale Price = Original Price - Discount Amount.

Front

What is the formula for calculating percent increase?

Back

Percent Increase = ((New Value - Original Value) / Original Value) x 100.

Front

What is the formula for calculating percent decrease?

Back

Percent Decrease = ((Original Value - New Value) / Original Value) x 100.

Front

If a shirt originally costs $10 and is on sale for 25% off, what is the discount amount?

Back

Discount Amount = $10 x (25 / 100) = $2.50.

Front

If the original amount is 72 and the new amount is 7, what is the percent change?

Back

Percent Change = ((7 - 72) / 72) x 100 = -90%. This indicates a decrease of 90%.

Front

What does a percent change of 0% indicate?

Back

A percent change of 0% indicates that there has been no change in the value.

Front

How do you find the markup price?

Back

Markup Price = Original Price + (Original Price x Markup Percentage / 100).

Front

If a comic book costs $3.95 and has a 20% markup, what is the retail price?

Back

Retail Price = $3.95 + ($3.95 x 20 / 100) = $4.74.

Front

What is the percent change when the number of students increases from 27 to 30?

Back

Percent Change = ((30 - 27) / 27) x 100 = 11% increase.