## Algebra 1: Common Core (15th Edition)

$25\%,\qquad$increase.
Percent change = $\displaystyle \frac{\text{new value-initial value}}{\text{initial value}}\cdot 100\%$ If the percent change is $positive$, we have an increase. If the percent change is $negative,$ we have a decrease. Percent change = $\displaystyle \frac{5-4}{4}\cdot 100\%=+25\%,\qquad$increase.