原帖由 prozzy 於 2007-5-18 23:05 發表。 
3 G1 l9 a l3 b. d2 K. O, R5 Tthe answer is -$97 for sure.
' U# H: P$ M3 ^( HTVBNOW 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。Think about it this way i$ ?% V" H# s( b) s+ B" r& F
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
7 H( m, D% n' D& E6 Y2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5 ?* N- `* G$ B! v3 w/ W- ntvb now,tvbnow,bttvb
& G+ `6 v5 t- a; A公仔箱論壇
; E0 t% q, g7 }( h' s8 P5.39.217.761) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong* c5 \5 I X% P. Q: e
5.39.217.76$ C$ d# j+ _( N# N6 Y& a( h
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.8 I/ \0 V# T' w4 E
5 \5 |) ^* _' N0 n8 G4 |/ v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. |