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The percent change is the increase or decrease in the value of a quantity. If the new value is larger than the original value then it is a percent increase and if the change in value is lesser than the original value it is called percentage decrease.

Discount is a percentage of the original price that is subtracted from the price of the item the final price is called selling price. It is a percent of the decrease in the cost.

We are given the following price and the discount percentages:

CD player: $89.99

discount: 15%

The discount is 15% of the price. We will subtract this amount from the original price.

So If x represents the new price after subtracting the discount then we have:

$\begin{array}{l}x=\text{Cost-Discount}\%\text{ofCost}\\ x=\$1099鈭�25\%脳\$1099\\ x=1099鈭�\frac{25}{100}脳1099\\ x=1099鈭�0.25脳1099\\ x=1099鈭�274.75\\ x=\$824.25\end{array}$

Thus, the discounted price of the CD player is $76.492.