原帖由 prozzy 於 2007-5-18 23:05 發表。 ! s5 q8 X8 P4 `: L+ c3 W
the answer is -$97 for sure.
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1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
( D' G4 q$ n' d A. r公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... & _4 P D7 v- W; A1 _
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公仔箱論壇* k. q; [; |: \7 a
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.
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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. |