AMC 8 1986 Problem 15
AMC8 1986 年第 15 题
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Sale prices at the Ajax Outlet Store are 50% below original prices. On Saturdays an additional discount of 20% off the sale price is given. What is the Saturday price of a coat whose original price is ?
Ajax 折扣店的促销价格为原价减 50%。周六在促销价的基础上再打 20% 的折扣。一件原价为 $180 的外套周六价格是多少？
- A.$54
- B.$72
- C.$90
- D.$108
- E.$110
正确答案 · Correct Answer
B
解析 · Solution
Solution 1
The sale price of the coat is (1-0.5)($180) = (0.5)($180) = $90. The Saturday price is (1-0.2)($90) = (0.8)($90) = $72.
After applying both discounts to an item, its price would be times its original price. Therefore, the Saturday price of the coat is .
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