原帖由 prozzy 於 2007-5-18 23:05 發表。 
8 x0 d! D5 y5 a7 Z' ?* w7 Y( [tvb now,tvbnow,bttvbthe answer is -$97 for sure. 公仔箱論壇6 C$ v. b% }- ?! w$ s
Think about it this way 5.39.217.76' @% t* d# @6 n! T9 V8 e$ a! K+ ~
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
+ q+ `9 e9 _2 h. l6 S; ]0 ?% o5 O公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... tvb now,tvbnow,bttvb0 `; P% z, G, R0 x
tvb now,tvbnow,bttvb. F x3 O1 m+ a; u! x+ s ^
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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 wrongtvb now,tvbnow,bttvb8 p( h { g* b4 i% v
4 u3 Y) x9 |/ E. \ A6 ?/ XTVBNOW 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。think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。% |! {- h8 L8 O7 @; j$ @- R
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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. |