原帖由 prozzy 於 2007-5-18 23:05 發表。  5.39.217.77:88986 I: U- ^' I- j0 O6 L# q
the answer is -$97 for sure.
7 v5 a$ C! Q) P公仔箱論壇Think about it this way 公仔箱論壇& U1 a P/ N; u8 B6 N7 f
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇* G2 s, p8 E! o0 I1 {; Q
2) Now, the owner discovered that the 100 bucks is fake. You can th ...
7 v% G+ c, r) A$ p1 q2 s/ q% }TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
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think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.* x2 X( |' I/ }" }. I: y% e
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I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |
發表於 2007-7-10 05:18 PM
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發表於 2007-7-11 03:19 PM
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