原帖由 prozzy 於 2007-5-18 23:05 發表。 
" N3 E; ?2 \5 o4 n& ntvb now,tvbnow,bttvbthe answer is -$97 for sure.
) o1 j. U+ @+ G' i1 pThink about it this way
4 S. a( h% ^; A6 A. e* v1 I1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
7 |0 u1 _# V+ J: V5.39.217.762) Now, the owner discovered that the 100 bucks is fake. You can th ... 6 m" C+ F6 ]" e3 J0 f公仔箱論壇4 Z0 M6 M* [% w& H
8 K* \ I) D; M" I1 T1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
. f" [- l; z+ `5.39.217.76 " ]% ^/ \: j& \' u" O* \. ]
think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
/ e V$ h$ h, d+ Q 公仔箱論壇2 u! N- F$ o4 d6 L: r+ n. L# g( w
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |