| tvb now,tvbnow,bttvb, u, l! g# ~' t% N- x2 M  I& `原帖由 prozzy 於 2007-5-18 23:05 發表。  ) e( Y8 O$ E- ?0 E+ P& d1 y3 tthe answer is -$97 for sure.
 * A4 u9 ?# h- |7 C; P+ DThink about it this way
 % e( E5 m7 F. a. h) _( U! n4 |2 t0 Z公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
 1 d+ o. f& ?% N; q- Z7 l- B8 C3 F6 s6 Z, h公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ...
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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,bttvb) q: T+ c: t" H- F; h7 e8 P3 r
 
 , e; Y( r" x& S" G: Z. s5.39.217.76think 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。7 ~& F0 F, N  i; I: ]( I. n" e
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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.
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