原帖由 prozzy 於 2007-5-18 23:05 發表。 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。- x: F3 u- G% p! H+ {2 w
the answer is -$97 for sure. / y! W! p8 c5 h1 K! ^
Think about it this way
! C0 y1 n1 U. h# h8 X; I' D* F) h公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)7 q- p' c( ^/ l) `2 O4 m
2) Now, the owner discovered that the 100 bucks is fake. You can th ... : m; e6 g, f2 x. x) Z) ] }, C. g公仔箱論壇& j; m8 v. P" d
2 c0 {5 s. j. |3 _" B, b1 k% C! Wtvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong: {8 d7 M# q% y0 Z
# i# @$ {& y4 @2 D1 y& }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.
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I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |