Answer:
subtract 5 off each sale price.
Step-by-step explanation:
if Anne gives away 5 dollar off coupons, for every coupon you have you subtract 5 off from the sale price. as long as the Sale Price allows more than one coupons to be stacked.
One Coupon:
15 would be 10
20 would be 15
Two Coupons:
15 Would be 5
20 Would be 10
