原帖由 prozzy 於 2007-5-18 23:05 發表。 1 x" p6 R" [" O7 J; I" `, Z# K9 i
the answer is -$97 for sure.
$ g$ ^% o/ P$ }1 VThink about it this way 公仔箱論壇4 ]! y5 m2 _5 \# C, c' X& Q- B
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
1 u/ ~1 r# S: k5 wtvb now,tvbnow,bttvb2) Now, the owner discovered that the 100 bucks is fake. You can th ... % S( m" X* E6 Q- _- R/ o
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( w2 x4 C% E2 i, s5 Itvb now,tvbnow,bttvb1) 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.公仔箱論壇" @- ~" X' `7 V% {7 A3 b- G
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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. |