Math 7 Unit 4 Percent Increase/Decrease

Front

What is percent change?

Back

Percent change is a way to express a change in value as a percentage of the original value. It is calculated using the formula: ((new value - old value) / old value) x 100.

Front

How do you calculate percent decrease?

Back

To calculate percent decrease, use the formula: ((old value - new value) / old value) x 100.

Front

How do you calculate percent increase?

Back

To calculate percent increase, use the formula: ((new value - old value) / old value) x 100.

Front

What is the percent change when a value increases from $18 to $45?

Back

150% increase.

Front

What is the percent change when Mary lost 30 pounds from 180 pounds?

Back

17% decrease.

Front

If a purse originally costs $25 and is on sale for $15, what is the percent decrease?

Back

40% decrease.

Front

What does it mean when sales tax is added to the price?

Back

It means that the final price a customer pays includes the original price plus an additional percentage for tax.

Front

If a shoe sales associate earned $300 in August and 8% more in September, how much did she earn in September?

Back

$324.

Front

What is the formula for calculating sales tax?

Back

Sales Tax = Price x Tax Rate.

Front

If a price decreases from $50 to $30, what is the percent decrease?

Back

40% decrease.