原帖由 prozzy 於 2007-5-18 23:05 發表。 
7 H7 s& N- |: b Y" p/ _5.39.217.76the answer is -$97 for sure. TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。- w& e2 [5 W" Y* |$ i/ d# c7 k3 l9 Y
Think about it this way # N2 I, b0 p9 u+ U) U
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇4 x( u4 d- c& ~' [6 q5 z2 V/ a
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 公仔箱論壇: k s( a* q: o( u1 V/ c7 Y
( s; }/ y0 S) P0 z) RTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。
) R! S- |7 T4 @" K. ]TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.76$ j& R: O% Y& ~" P3 h& V
tvb now,tvbnow,bttvb# ~% q2 B( A) m! p% t/ a6 n- Q6 o
think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
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, {# F* G0 O( X$ F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. |