原帖由 prozzy 於 2007-5-18 23:05 發表。 
4 e9 t* F! `4 g公仔箱論壇the answer is -$97 for sure. 5 l6 o* A6 r; L* m9 l1 u3 B8 }
Think about it this way ' p. e( O7 n3 ]& a' j ^
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)www.tvboxnow.com! L# ]. v2 _: {/ ?% P" P0 e
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 8 I( B. |* W: a4 E9 o
2 T3 _* A! o) Z) h( p% w6 D
" } L& d! v E, Ctvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
6 L- K0 T q& I. d2 K" |* m8 Zwww.tvboxnow.com tvb now,tvbnow,bttvb S* {" A$ U- K1 d( M
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.tvb now,tvbnow,bttvb& H4 H% z+ l8 S+ j
' }# g- j N; v% l, _; H0 lI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |