原帖由 prozzy 於 2007-5-18 23:05 發表。 
6 i; j9 Z( Q- k2 e0 w5.39.217.76the answer is -$97 for sure. " V9 ]2 a7 W' t& W6 s' n. o) {
Think about it this way
: S' ^) ?% ^5 _$ g( ^, b `7 S7 @公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)/ j. m/ C3 \- ]$ c# f. t" F
2) Now, the owner discovered that the 100 bucks is fake. You can th ... n& Y# m/ R" `+ k% D: N公仔箱論壇8 X% n l8 g/ k( K8 L8 T
b6 K5 n+ l8 ~- m- H1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
+ X9 P" ]# t+ O; v1 P1 q5 `" Htvb now,tvbnow,bttvb
3 S3 F2 p" U2 Z! e$ x5 E4 J7 ~3 N4 stvb 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.; C5 h8 ~8 E4 _* z! d
" u+ L4 z: {6 J7 W4 OI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |