2013 AMC 8 第 2 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
2.
鱼市的招牌写着：“仅限今天， 折扣：半磅装每包只要 。”一整磅鱼的正常价格是多少美元？
A sign at the fish market says, “ off, today only: half-pound packages for just per package.” What is the regular price for a full pound of fish, in dollars?
小提示：
标出的价格是半磅打折后的价格
The quoted price is for a half pound after the discount.
大提示：
先撤销 折扣，再加倍得到一磅价格
First undo the discount, then double to get one pound.
视频讲解：
Click to load, then click again to play
文字解答：
促销时半磅价格为 ，所以一磅促销价为 。
促销价是正常价格的 ，所以正常价格是促销价的两倍。因此一磅鱼的正常价格是 。
所以正确答案是 D。
During the sale, the price for half a pound is and therefore, the price for a full pound is
The sale price is off the regular price, and so the regular price is twice the sale price. Therefore, the regular price for a full pound of fish is
Thus, D is the correct answer.
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