原帖由 prozzy 於 2007-5-18 23:05 發表。 
! W, ]- K8 b: m: F0 P1 w) T* jthe answer is -$97 for sure.
: z) ^% s' p$ }9 I$ dThink about it this way
# h6 \5 j3 x, z5.39.217.761) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
8 c/ t K* w9 g/ s4 Y& u2 g9 c2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5.39.217.760 J( l3 I9 C4 Z3 E, O
3 h- i3 k* X4 d! _( L& ^( L5.39.217.76 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。; z7 \/ R' H8 @4 M0 \$ D6 H
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongTVBNOW 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 b* W# f, u# n3 y1 o+ O
9 E. c% I( C( }1 B公仔箱論壇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.
( ~, r6 v% S8 dtvb now,tvbnow,bttvb
$ c3 c9 M) u/ p! _7 }0 ZI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |