原帖由 prozzy 於 2007-5-18 23:05 發表。 
, n5 b, z; @1 w: }. Y4 b* U公仔箱論壇the answer is -$97 for sure. 6 b& v3 h2 A: G
Think about it this way 8 A; S* k' w& s1 z' j% R
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
% a& N- f+ ?' G( ^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6 H) N6 Y! c4 B8 y4 k
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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.
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1 Y4 i+ s: T3 x1 o2 ?* nI 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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