原帖由 prozzy 於 2007-5-18 23:05 發表。  ) g) P( K! v& u; n0 z
the answer is -$97 for sure. tvb now,tvbnow,bttvb1 I: t& I" a* U* d/ C4 i
Think about it this way 3 X6 L8 [1 H; z6 `( X( X! Z
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb9 q6 `. B( N, W! B+ n
2) Now, the owner discovered that the 100 bucks is fake. You can th ...
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$ o5 B& A7 \- m- s+ Ntvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongtvb now,tvbnow,bttvb3 i' l# Y8 n+ s& l# W( R# x
tvb now,tvbnow,bttvb1 V2 {5 D# J& _6 j* n
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.
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/ V' {6 ]! c! L% V4 u5.39.217.77I 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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