2. 外语
  3. A farmer buys a horse for $ He sells it to his neighbour for $ Then he discovers he could have made a better deal. He borrows $

A farmer buys a horse for $ He sells it to his neighbour for $ Then he discovers he could have made a better deal. He borrows $

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问题 A farmer buys a horse for $ He sells it to his neighbour for $ Then he discovers he could have made a better deal. He borrows $ 10 from his wife, and buys the horse back for $ 80. He then sells it to another neighbour for $ How much money did he make?
选项
答案$10
解析 第一次买马花费$60，卖了$70，共盈利$10。第二次买马花费$80，卖了$90，再除去借妻子的$10，共盈利$0。所以，通过两次对马的买和卖，他共盈利$10。
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