You spend $30.40 on 4 CDs. Each CD costs the same amount and is on sale for 80% of the original price.

a. Write and solve an equation to find how much you spend on each CD. Let p represent the price you pay for each CD.

Let "p" be the price you pay for each CD's

Since 4 CDs cost 30.40, the price you pay for each CD (p) is calculated as = total price for all CDs / number of CDs

So, the price you pay for each CD (p) = 30.40/4 = $7.60

Since you paid 80% of the original price of each CD = 7.60/0.8 = $9.50

The price you paid for each CD = $7.60 per CD

The original price for each CD = $9.50