原帖由 prozzy 於 2007-5-18 23:05 發表。 
( @1 _3 D# }* h8 [公仔箱論壇the answer is -$97 for sure.
5 K; x) S0 P3 S' A7 _# cThink about it this way
" ]9 ]" H( B- c4 a2 _8 z$ G1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)7 k4 O- \, l3 C- g6 N
2) Now, the owner discovered that the 100 bucks is fake. You can th ... / I: s9 N9 s" Y9 \0 L9 q9 M) \' [9 {公仔箱論壇
~0 G$ G! b8 J$ _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。
' w) u- {# M$ i ~" k, {8 Z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 wrongtvb now,tvbnow,bttvb! x4 q. M7 ^5 g2 W2 p
( `, w; v* r/ p% x5.39.217.76think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
2 E" k$ A3 h5 H( u2 }& H
( |! V1 |% W! _公仔箱論壇I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |