原帖由 prozzy 於 2007-5-18 23:05 發表。 
; K: \6 d5 s/ F6 \% W. k* R+ J7 b0 N& S5.39.217.76the answer is -$97 for sure.
5 I' b- L' O( {* `Think about it this way
5 b3 V, @7 @; [3 V% s0 q公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇. k- a" s! M3 [( n" ? N& D- ~
2) Now, the owner discovered that the 100 bucks is fake. You can th ...
5 g) f" q N6 b# |/ a- u: y9 [' W5.39.217.761) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。" K; n) J% \- x- f3 [$ j
. v; m! I) s) A" R# m' e8 |TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
2 Z) f3 a! i. D, R% G0 _TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。 7 S' e" h7 [$ N5 @3 H1 R& m4 u
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |
發表於 2007-7-10 05:18 PM
| 
發表於 2007-7-11 03:19 PM
| 
