原帖由 prozzy 於 2007-5-18 23:05 發表。 
& H5 `4 \* D! [" G5.39.217.77the answer is -$97 for sure.
: u2 j t' W; W& M$ P' JThink about it this way $ J) ]% j$ z! b7 y$ y
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.77+ ]0 Y" v! p1 L- x
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 3 G4 E- \# V4 B. u0 q3 W* _: ]$ GTVBNOW 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。- G$ K I2 ^+ ?
4 P0 B4 H' K* F6 w( Ftvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong7 k m2 @6 Q- T8 C+ @( u
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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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5 h) U! C) _. [' J* Ttvb now,tvbnow,bttvbI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |