原帖由 prozzy 於 2007-5-18 23:05 發表。 tvb now,tvbnow,bttvb) Z; Z+ K" @6 e, G' J) W `1 t A$ a
the answer is -$97 for sure. 公仔箱論壇2 a* d5 o9 Z- F/ d" z) z
Think about it this way
6 {' F0 L1 T1 ~# A公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.769 ?7 q0 G+ W( m+ A. h
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 4 ]/ x; q2 Q0 P. |& ~6 l4 e6 W7 K3 N% x! {0 c
- z( a- x3 @# t公仔箱論壇1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong公仔箱論壇0 f) g: v) r$ o3 F2 U, |
0 M8 [7 l' e0 E; g5.39.217.76think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
; ~2 z6 c& S) ^8 P8 [: t. ftvb now,tvbnow,bttvb 公仔箱論壇8 b% J$ a! I9 \* h8 ~& {
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |