原帖由 prozzy 於 2007-5-18 23:05 發表。 
1 y( K: s7 b! X( _0 T2 J& `/ Y$ n. Y公仔箱論壇the answer is -$97 for sure. 4 N/ r9 t$ |/ K4 G# a1 X
Think about it this way
! f1 x6 u- P8 f) O stvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
2 _, ?/ ^! K! S5 v/ j9 _3 y5.39.217.762) Now, the owner discovered that the 100 bucks is fake. You can th ... 5.39.217.76# B" A1 M$ `) e; K
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3 R1 p$ X8 f7 V/ T) c- U2 Qtvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.768 M9 ]. ~( ~2 ?" l m" M- A
7 f" C Y' h, `think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.tvb now,tvbnow,bttvb4 e g1 T6 f. r+ t; K! _
) M( {; a% E; H$ |) o$ O6 j( |I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |