原帖由 prozzy 於 2007-5-18 23:05 發表。 
1 ^8 q: K7 l8 S) x, j' e" X/ O0 ~5.39.217.76the answer is -$97 for sure.
; o- d8 @: u5 |公仔箱論壇Think about it this way
C2 j6 q/ y6 P1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇% v# d3 z3 I- |. S) B# S9 E
2) Now, the owner discovered that the 100 bucks is fake. You can th ... * r" H8 } x2 Z( \7 G
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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
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% v& q" g% [& f公仔箱論壇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.
) r4 w. P6 Y! e0 U K5.39.217.76 tvb now,tvbnow,bttvb0 Y" ~5 s" W7 B
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |