原帖由 prozzy 於 2007-5-18 23:05 發表。 
. r- j5 [6 T4 p {& o8 A$ \the answer is -$97 for sure. 公仔箱論壇% |& y' ^" ^1 y! {" C* ?( V2 s- ~
Think about it this way
, `+ I, U0 \) y r6 v2 a1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
$ o9 [ f; b+ c) 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。2) Now, the owner discovered that the 100 bucks is fake. You can th ... ( G+ O. k) Z+ e% L0 s$ WTVBNOW 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 F: Q4 o, \. K公仔箱論壇 公仔箱論壇1 r& l1 ~8 H: p% f$ f0 O; y
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0 X) x4 {2 k8 J/ h* E
1 j+ N4 u2 z# \6 n' P6 R' J公仔箱論壇think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。1 f5 B. }9 E$ P" \
. t. M( A" k* X4 c; F6 F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. |