Answer
$27$%
Work Step by Step
To find how much the price increased, use the ratio $\frac{price increase}{original price}$.
First subtract 19 by 15.
19 - 15 = 4.
That is the price increase.
Then, divide the price increase (4), by the original price (15).
15 $\div$ 4 = 0.2666666667.
To change this decimal to a percent, just multiply by 100. So you get 26.6666666667.
Round it to the nearest whole percent, $27$%
