原帖由 prozzy 於 2007-5-18 23:05 發表。
1 R3 {# P+ q% x! Cthe answer is -$97 for sure.
% r; H$ M z* u" A公仔箱論壇Think about it this way
6 }5 e# [7 r; |# ~& ?' X+ o1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.76* R! W7 Z7 ^/ p+ q" Y
2) Now, the owner discovered that the 100 bucks is fake. You can th ... $ t$ f6 @& T' w' E4 e, C- w' ^0 |. x5.39.217.76, ^) J d- X% f. y/ N0 G6 l0 Z0 K
* {& p) ]& a' z1 o, stvb 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% w7 |# W% q4 w) i
8 i6 w% O ?- ?( M2 X! u5.39.217.76think 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,bttvb0 A" J! x" |& g, f2 _2 y
& |4 k5 H; G2 R2 s: U1 q& E5 d! {
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |