原帖由 prozzy 於 2007-5-18 23:05 發表。 
$ i: S0 x( I, m# |; E: q3 T& @5.39.217.76the answer is -$97 for sure.
% W' L( f4 x5 v' p" W oThink about it this way
7 {0 |7 C- Z, z+ G 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。1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.76) Q8 z; z) z( C: R) Q) c
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 9 `3 a$ q7 m1 _, Z- z$ p8 n/ p$ LTVBNOW 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。 ], C2 O0 V2 T$ h* c
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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
0 {8 l; l! m, Q2 s$ L tvb now,tvbnow,bttvb! t. M0 l# {2 |7 ]2 V" A' x n1 K
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.
9 ~" |' t4 t! o0 tTVBNOW 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。 tvb now,tvbnow,bttvb5 ]; ?/ R) ?% _
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |