原帖由 prozzy 於 2007-5-18 23:05 發表。 1 L, J) J" h% u+ \& \- j' v) H
the answer is -$97 for sure. tvb now,tvbnow,bttvb+ s' \8 B. j& {+ K% X, e% L1 I2 j
Think about it this way
3 K0 v- Z7 }0 E$ @# V. K1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
$ c% B. N' H) f+ w. F2) Now, the owner discovered that the 100 bucks is fake. You can th ... 1 q# S) u: I; n6 Q0 P公仔箱論壇
; Z5 I& j+ `/ k: Z" b R公仔箱論壇
& g; i1 g; T) o8 }5 PTVBNOW 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 wrong+ I/ k" T3 ]" T r6 z9 ^( s
公仔箱論壇& A. O ?0 d# O' S( T
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.
; L) N3 t. m8 i. N4 t* e 5 R2 l5 b- m, E3 |+ { R- L
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |