Elementary Algebra

To find the percent change, we use the following formula: percent change = $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100% The original price was 8.00 dollars. The new price became 20.00 dollars. Substituting these values into the formula yields percent change = $\frac{20.00\ -\ 8.00}{8.00}$ $\times$ 100% percent change = $\frac{12.00}{8.00}$ $\times$ 100% percent change = 1.5 $\times$ 100% percent change = 150% Because the percent change is a positive number, it is a percent increase.