原帖由 prozzy 於 2007-5-18 23:05 發表。 
0 a- D. x* \7 q; R. r公仔箱論壇the answer is -$97 for sure. TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。& {2 J! @8 F; U' \+ o, L2 u
Think about it this way % W6 Y; r- v! ^- \( I1 n2 L
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
2 z }4 t, Y6 z1 }* s3 i5.39.217.762) Now, the owner discovered that the 100 bucks is fake. You can th ... ; l8 |/ c9 O# f; x
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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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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.
0 @9 u7 ?! M b/ A: ntvb now,tvbnow,bttvb 公仔箱論壇% m7 w' P" b/ w7 X) ]0 x# p1 T
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |