Question

Your station charges $16.50 for a lubrication job. As a promotion you sell six coupons for lubrication jobs for $90. What percentage discount are you offering for customers who purchase the 6-coupon lube book?

Answer 1

90/6*16.5
=90/99
=.909
ans*100
=you are paying 90.9% of full price which would then mean you would be saving 10.1%

Answer 2

another approach
6 jobs @ 16.50 each would cost 99
6 jobs with coupon cost 90
discount (99 - 90) = 9
percent means per 100
discount as a percentage ,x
9/99 = x/100
x = 900/99 = 9%