原帖由 prozzy 於 2007-5-18 23:05 發表。 
& C: Z E$ V+ T+ L. B+ othe answer is -$97 for sure.
! g) o- Z! j c! V Z6 ktvb now,tvbnow,bttvbThink about it this way
/ m* |, U" L8 BTVBNOW 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) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
6 W ]( Z7 s9 K" v, V2) Now, the owner discovered that the 100 bucks is fake. You can th ... 3 N) a: U s( N! j, p+ Utvb now,tvbnow,bttvb公仔箱論壇, V% p9 A1 G, i+ y% m C
" z5 u# V! Z2 K! S+ p1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongtvb now,tvbnow,bttvb9 n$ B; H( w+ t& L1 v7 O5 b% ]7 C
) x0 ~5 s0 T' w/ D) M/ N& rTVBNOW 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。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.+ }+ V; K' k2 u+ C# }) b* h
5.39.217.767 q* }1 }/ y1 @' Y# D! g
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |