原帖由 prozzy 於 2007-5-18 23:05 發表。 
: B0 N$ B% F# O% m# l- W5 m5 [the answer is -$97 for sure. 1 `3 _2 j) d+ \$ \6 |$ J
Think about it this way tvb now,tvbnow,bttvb( E( ~5 |$ a ~ B i
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
9 N4 \. c$ U7 X* J' W0 [, H5.39.217.762) Now, the owner discovered that the 100 bucks is fake. You can th ... 5.39.217.767 a X; F2 V3 {. r# z$ `. O' B
* x7 d( n! a& [- c
% T" O9 H, }" P5.39.217.761) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.768 Q" H; |2 f7 B( ?
tvb now,tvbnow,bttvb5 O2 z& G# R5 b( P
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.
+ B' g; ~# ~: N0 e7 ]6 g" X# `
1 _* g# f/ ]3 @3 l8 q) N9 s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. |