原帖由 prozzy 於 2007-5-18 23:05 發表。 
3 j w6 y' {6 e3 c! E" ~0 Othe answer is -$97 for sure. 5.39.217.76$ C: d$ l! j1 @( m
Think about it this way % p- ^# @$ E2 o) J' E8 f! s2 V5 C+ s
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
# M8 T2 ?" f9 T6 k* D3 b2) Now, the owner discovered that the 100 bucks is fake. You can th ... 公仔箱論壇& P$ r% b( c9 F+ e7 n- v* ~ }$ A4 F
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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。( \! Z" h* j2 [8 q) I
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
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+ g3 B- T4 R% M i5.39.217.76think 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.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" F: ^7 T. {7 w( w6 |
/ L" p( Y# \$ z7 L# D) L3 J0 }I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |