原帖由 prozzy 於 2007-5-18 23:05 發表。 
( R4 H+ W/ v) _- ?6 H5 S. s公仔箱論壇the answer is -$97 for sure.
- I3 n' b' Z& u! y& l( K公仔箱論壇Think about it this way
2 [' z, D, H3 l: d; j, f2 A1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
, ]! Z; O# }1 T; t, U5 K* P2) Now, the owner discovered that the 100 bucks is fake. You can th ... 2 l' F; w3 a E+ r+ Xtvb now,tvbnow,bttvb$ n9 S3 F) f/ {) g+ N7 G. c3 M4 R
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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 wrong5.39.217.77: V- w# ]6 X, Y; N" ~; L* j
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think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.4 v3 K% `* v6 M9 \" y
! _: I J: p5 ]# a$ YI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |