Answer
$-25\%,\qquad $decrease.
Work Step by Step
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{3-4}{4}\cdot 100\%=-25\%,\qquad $decrease.
