原帖由 prozzy 於 2007-5-18 23:05 發表。 " F( n L0 A/ z3 J6 ]
the answer is -$97 for sure. 公仔箱論壇. i0 @$ N* L3 _4 B! n5 ^, F
Think about it this way " Z9 H7 I6 Q' d' {! A4 Q" r
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.768 q+ K0 k: a9 X
2) Now, the owner discovered that the 100 bucks is fake. You can th ... ( l; U+ x+ W% }! Q; P' @( u& J$ I6 _9 @% j
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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公仔箱論壇1 i3 s& j& ~& v" A* E9 n
- D$ A. c7 m) ]- Y1 m7 Tthink 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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I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |