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Re:40 70 50 20 这个sample， customer 用了20块的真钞，得到了价值40块的物品和20块的零钱，那jame的损失不是40块么？怎么是20，难道零钱是假的？

Posted by tdzl2003 at 2005-07-31 14:32:23 on Problem 2521
In Reply To:40 70 50 20 这个sample， customer 用了20块的真钞，得到了价值40块的物品和20块的零钱，那jame的损失不是40块么？怎么是20，难道零钱是假的？ Posted by:sunmoonstar_love at 2005-07-31 12:34:07 
实际上customer 付了90所以
(90-20-50)是customer的总花费，
40是customer的总获得，
损失是40-20=20没错.
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