Discounted Discount

Paul found a pair of trousers on the clearance rack discounted 80%. He also had a coupon that entitled him to an additional 15% off. He took the trousers to the checkout expecting to get 95% off. What mistake did Paul make? What was the actual discount Paul received?

Double Discount

Dagmar found a dress on the clearance rack for ¾ off the original retail price. She also had a coupon entitling her to an additional 15% off. The original price of the dress was $64. What was the price after discounts?