原帖由 prozzy 於 2007-5-18 23:05 發表。 
$ {7 O& F$ T, f J1 U) V, pthe answer is -$97 for sure. 5.39.217.76 H# [/ N9 j6 |# f' H, i
Think about it this way
3 x( _. s Y* D' b2 i5.39.217.761) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
* T: T. s9 T( Q! \公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... 6 r; A. M: c) N* {) M; d' [9 K3 }: k) H* t8 o+ U4 |/ F: a1 q
! x) I1 J* `! a, T公仔箱論壇1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.763 [6 [ n: R# m7 D: m# q- }/ F
TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。8 @: K( @5 R$ r0 S6 a) C
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.5.39.217.76 C" p3 N& U+ x* v: f
# |. p9 V8 y- ?- P6 j, 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。I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |