原帖由 prozzy 於 2007-5-18 23:05 發表。 
+ a' v K% H/ o# g; Q: s. a5.39.217.76the answer is -$97 for sure. 2 u0 Z8 V# S# a; l
Think about it this way
" R: {- |# o. y8 O. j e' L' Wtvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)" _' [6 L/ ~( u0 r3 y1 s2 S
2) Now, the owner discovered that the 100 bucks is fake. You can th ... % ~" ]/ a' n3 Z$ J7 y! x5.39.217.76
+ E8 s% n3 c. |/ y$ jtvb now,tvbnow,bttvb
- |' }3 b2 [% G; o5 [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。1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5 y9 K* |# k( n. f) x% L! J3 i$ ?1 {
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。- W$ _, F* I: k! [& Z" b( a
think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
, d( J' A+ H+ b/ G' F公仔箱論壇 " F. L; g' P( R" [8 f$ v
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |