Your station charges $15.95 for an oil change. As a promotion you sell six coupons for oil changes for $80. What percentage discount are you offering for customers who purchase the 6-coupon book?

Discount (to the nearest tenth) =

You are offering 16.4% for customers who purchase the 6-coupon book for the oil changes. This problem can be solved by doing a simple percentage formula of mathematic. The customer had to pay $80 only for six oil changes which cost $95.7 ($15.95 * 6) at the original price and the difference between the coupon price and the original price is the discount (($95.7-$80) / $95.7 * 100%).