Chapter 7, Problem 40CR

To determine

To Calculate: The percent of change as an increase or decrease.

Answer to Problem 40CR

The percent of change is an increase of $80\%$ .

Explanation of Solution

Given Information: Original amount is $50$ and the new amount is $90$ .

Formula Used:$Percentofchange,p\%=\frac{Amountofincreaseordecrease}{OriginalAmount}$

The new amount $90$ is greater than the original amount $50$ .

So, the amount of increase is $90-50=40.$

Therefore, percent of increase (as a decimal) $=\frac{40}{50}=0.8$

To write the decimal $0.8$ as a percent, move the decimal point $2$ places to the right and suffix a $\%$ sign.

So, write $0.8$ as $80\%.$

Therefore, the percent change is an increase of $80\%$.