原帖由 prozzy 於 2007-5-18 23:05 發表。
# ]* V2 a V: q mthe answer is -$97 for sure.
; x$ j( D+ I1 w! ?+ \% ^Think about it this way tvb now,tvbnow,bttvb/ I- G7 D* S: G# i* H+ D
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
; _2 _' ^1 ~6 a9 Z3 _2) Now, the owner discovered that the 100 bucks is fake. You can th ... , q. O2 ~8 N* p9 l( }, H
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
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$ `+ V4 y! t* }) ^1 i* Hthink 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.
8 |) N) @. `7 f# X ' u: B1 c/ T3 T3 ?
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |