Percent Change Flashcard

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 percent increase?

Back

To calculate percent increase, use the formula: \( \text{Percent Increase} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100 \% \)

Front

How do you calculate percent decrease?

Back

To calculate percent decrease, use the formula: \( \text{Percent Decrease} = \frac{\text{Old Value} - \text{New Value}}{\text{Old Value}} \times 100 \% \)

Front

If a book's price increases from $15 to $18, what is the percent increase?

Back

20%.

Front

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

Back

$86.25.

Front

A water tank holds 150 liters of water. After some water is used, it now holds 120 liters. What is the percent decrease?

Back

20%.

Front

A school's enrollment increased from 800 students to 880 students. What is the percent increase?

Back

10%.

Front

If a jacket is originally priced at $90 and then marked down to $63, what is the percent decrease?

Back

30%.

Front

What is the formula for calculating the new price after a percent increase?

Back

New Price = Old Price + (Old Price × Percent Increase) / 100.

Front

What is the formula for calculating the new price after a percent decrease?

Back

New Price = Old Price - (Old Price × Percent Decrease) / 100.