原帖由 prozzy 於 2007-5-18 23:05 發表。 
( `% p! J1 T% X F' h9 Q. p+ `" ETVBNOW 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。the answer is -$97 for sure.
! U- n( B, r* Y- t. Y5 k" r公仔箱論壇Think about it this way
$ \2 f& d5 V& n. u8 _1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)( e- V8 o& B2 G; X; f8 C# b' ?9 z
2) Now, the owner discovered that the 100 bucks is fake. You can th ... TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。- W8 ~4 | n+ A) K( l
tvb now,tvbnow,bttvb; x( c" i% N3 b: A% R* r9 Q2 a
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
9 v' f$ }9 `3 B5 I5 |; T# K公仔箱論壇 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。( x( f3 R# `( i7 Q
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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% q; e q: i* S# G公仔箱論壇I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |