原帖由 prozzy 於 2007-5-18 23:05 發表。 
9 }2 q/ Q4 |7 @1 b8 @ U( P* Ethe answer is -$97 for sure. 公仔箱論壇, N4 O; M& V9 q8 t
Think about it this way ! }- n3 h& Y; j+ I
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
6 e- C9 C3 P8 d4 O- N2) Now, the owner discovered that the 100 bucks is fake. You can th ... 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。! S! v7 K4 T2 T# N
公仔箱論壇. b! ?8 {& I" A9 ?( C
" D& t9 A; `( k/ `! u) `: p1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.768 A8 L9 p. r( } Y. @* I0 W: S n
" v9 [9 B4 C& ? Q% X( Athink about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
% `3 b; M' V* ~! h: QTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。
& A4 a& d7 @' O$ w. x2 s% a: {# nTVBNOW 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. |