原帖由 prozzy 於 2007-5-18 23:05 發表。 公仔箱論壇4 g# W" b, L5 K( }! H
the answer is -$97 for sure.
8 p4 @ c, ?5 D% y- ETVBNOW 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。Think about it this way 1 u" T8 o9 H6 w2 g
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
( g/ H4 V$ S' u8 Z5 g u2) Now, the owner discovered that the 100 bucks is fake. You can th ... 公仔箱論壇+ W; j8 F3 X8 M# D2 F2 M
7 A @7 `; n7 }1 F; p% T" i) s$ E 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。$ B7 m8 T1 |( N. z
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong公仔箱論壇7 L0 }( | {+ Q1 A+ D% M
公仔箱論壇$ Y( m' ]% }$ W: ~! y+ {
think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
! G( P% q! A$ f7 j1 e% b' Ztvb now,tvbnow,bttvb
, M# E% f# p) P. n; W3 \) M! h; H5.39.217.76I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |