原帖由 prozzy 於 2007-5-18 23:05 發表。 公仔箱論壇! S8 y$ {) a' [
the answer is -$97 for sure.
* ` T3 A2 c0 X( k. X# `公仔箱論壇Think about it this way " m$ J- }+ C, F! ~6 h
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
* z' _7 s* I9 w. v! j, R% Xtvboxnow.com2) Now, the owner discovered that the 100 bucks is fake. You can th ... 4 Z" ?# c' k; D$ ]4 N; O0 G
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9 \" y+ ]6 c8 S. h9 c. U公仔箱論壇1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong* ^1 m5 H' t& g5 X# d) `6 C* Z3 ~
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think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.- _) v- U2 T' A$ Q- p O* P
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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. |