原帖由 prozzy 於 2007-5-18 23:05 發表。 
* {$ ^# L& A0 k, }4 T5.39.217.77:8898the answer is -$97 for sure. 公仔箱論壇& n* T- t" D/ f
Think about it this way 4 c' x/ F1 g0 _, Z- _5 Q4 b
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb# T! }5 X$ r. d* w
2) Now, the owner discovered that the 100 bucks is fake. You can th ... tvb now,tvbnow,bttvb" @2 B) ?* B8 w% ?
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
: q6 k- I: M9 _1 e3 \- ~公仔箱論壇
0 H/ R0 i; v# h( dtvb now,tvbnow,bttvbthink about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.tvb now,tvbnow,bttvb5 I: t' a$ p4 v6 v4 G
6 E* e; S6 F- t8 G5.39.217.77:8898I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |