原帖由 prozzy 於 2007-5-18 23:05 發表。 
8 A8 M; o, {" z# N& Z( g7 g. G5.39.217.76the answer is -$97 for sure. 5.39.217.76& Q5 z5 q% h) w! {5 m/ f( B
Think about it this way ) I0 R2 N& R* a7 B Z& p
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
# x6 x: K5 z% [9 ^2) Now, the owner discovered that the 100 bucks is fake. You can th ... " D0 G6 {, P3 e; T公仔箱論壇
8 W9 \8 D1 M# i# {tvb now,tvbnow,bttvb
1 ?+ K7 [+ a& Z8 p0 @4 f5 Ttvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong公仔箱論壇' l. S+ F. y' W. `) t7 \! i" \- Q
# j3 M" R, a9 e2 I) B, k( t: V# utvb now,tvbnow,bttvbthink about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
3 h3 Z R6 ?2 C s% X: G5.39.217.76
& f: Q$ {5 p p; q# B& Otvb now,tvbnow,bttvbI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |