Percents and Percent of Change

Front

What is a percent?

Back

A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.

Front

How do you calculate the percent of change?

Back

Percent of change = ((New Value - Old Value) / Old Value) x 100.

Front

What is an increase in percent?

Back

An increase in percent indicates how much a value has grown compared to its original amount.

Front

What is a decrease in percent?

Back

A decrease in percent indicates how much a value has reduced compared to its original amount.

Front

If a quantity increases by 25%, what is the new amount if the original amount is 100?

Back

New Amount = Original Amount + (25% of Original Amount) = 100 + 25 = 125.

Front

What is 45% of 200?

Back

45% of 200 = 0.45 x 200 = 90.

Front

What is the percent of change from 50 to 75?

Back

Percent of change = ((75 - 50) / 50) x 100 = 50% increase.

Front

If a product costs $80 and is discounted by 20%, what is the sale price?

Back

Sale Price = Original Price - (20% of Original Price) = 80 - 16 = $64.

Front

What is the formula to find the original amount if you know the percent and the new amount?

Back

Original Amount = New Amount / (1 + Percent Increase) for increase, or Original Amount = New Amount / (1 - Percent Decrease) for decrease.

Front

What is the percent of change from 30 to 15?

Back

Percent of change = ((15 - 30) / 30) x 100 = -50% decrease.