Percent Change Practice

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: \( \text{Percent Change} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100 \% \)

Front

How do you calculate a price increase of a product?

Back

To calculate a price increase, multiply the original price by the percent increase (as a decimal) and add that amount to the original price. Formula: \( \text{New Price} = \text{Original Price} + (\text{Original Price} \times \text{Percent Increase}) \)

Front

How do you calculate a price decrease of a product?

Back

To calculate a price decrease, multiply the original price by the percent decrease (as a decimal) and subtract that amount from the original price. Formula: \( \text{New Price} = \text{Original Price} - (\text{Original Price} \times \text{Percent Decrease}) \)

Front

If a product costs $75 and increases by 15%, what is the new price?

Back

The new price is $86.25.

Front

If you finish a level in a video game in 32 minutes and then in 28 minutes, what is the percent change?

Back

The percent change is a decrease of 12.5%.

Front

What is the formula for calculating percent decrease?

Back

The formula for percent decrease is: \( \text{Percent Decrease} = \frac{\text{Old Value} - \text{New Value}}{\text{Old Value}} \times 100 \% \)

Front

What is the formula for calculating percent increase?

Back

The formula for percent increase is: \( \text{Percent Increase} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100 \% \)

Front

A store reduces an item from $40 to $30. What is the percent decrease?

Back

The percent decrease is 25%.

Front

A town's population increased from 1,200 to 1,440. What is the percent increase?

Back

The percent increase is 20%.

Front

A car's value decreased from $22,000 to $17,600. What is the percent decrease?

Back

The percent decrease is 20%.