原帖由 prozzy 於 2007-5-18 23:05 發表。  公仔箱論壇4 @5 P3 [, t; F' |" w
the answer is -$97 for sure. 公仔箱論壇$ T- F2 i* R- |, b& A5 j" o+ f
Think about it this way
1 |- f, f- E- P1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)* F4 f8 [, a' ^4 b# _% ~
2) Now, the owner discovered that the 100 bucks is fake. You can th ...
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong公仔箱論壇# g/ }) I& W2 r% J/ _6 p' n
) G8 z! i+ M4 X: Q% C; ithink 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.公仔箱論壇" [' Z+ O- d) f% R7 y
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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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