原帖由 prozzy 於 2007-5-18 23:05 發表。 9 F( W- P' T$ K& U+ e9 B* k( H: O
the answer is -$97 for sure.
% A* X4 j2 ?9 ] o; Y. o* I# \1 e: |Think about it this way + K, u; W; ]8 ~+ w0 Z8 [ N4 e
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
$ L2 j0 `; R+ V/ h1 ntvb now,tvbnow,bttvb2) Now, the owner discovered that the 100 bucks is fake. You can th ... 公仔箱論壇* N+ x, L% y! X5 o
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3 K: [9 K' ^, v' R2 F+ x+ x2 ]2 R* |tvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongtvb now,tvbnow,bttvb. U- h+ L# F- F a
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think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
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$ W. z# W; X3 j' |I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |