原帖由 prozzy 於 2007-5-18 23:05 發表。 
* ?1 P3 I" E1 x$ A公仔箱論壇the 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。+ i* p( d5 V. T& }7 M! Y+ s M& H3 {
Think about it this way
. v2 D2 y3 ]- c; c, f5.39.217.761) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.765 x d7 J! \% _, e0 R' V4 Q* v
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5.39.217.76* j3 T# P* ]2 ?
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$ g6 t: G$ C, \$ o4 M/ ~# t3 p1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.76; B" F; T( j; p" j& X) H
公仔箱論壇, G7 o, `* n1 A! T3 d A" v
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.
; q1 k7 T/ J( Y, g) I8 ~% ftvb now,tvbnow,bttvb
' S( R m' D5 a8 f2 k A" f& _5 Htvb now,tvbnow,bttvbI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |