原帖由 prozzy 於 2007-5-18 23:05 發表。  5.39.217.775 {8 r5 ~! q5 Y) z$ ^: z- C! u& T
the answer is -$97 for sure. 公仔箱論壇$ \, Y: m1 v5 a6 a7 |' |
Think about it this way 3 o# e+ d( T& z7 t D# V
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
! C' r$ {) M) A$ l4 T9 V2) Now, the owner discovered that the 100 bucks is fake. You can th ...
3 {# Z" R3 i" S7 [公仔箱論壇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 $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.; W5 u# t$ z8 `
4 S& F Y A/ B3 V; ftvb now,tvbnow,bttvbI 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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