原帖由 prozzy 於 2007-5-18 23:05 發表。 
+ l; E7 y: [- Othe answer is -$97 for sure.
+ U( ], F0 ?7 s5 jThink about it this way
! p! {3 j" i( Y# B9 d/ ~% |tvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
) j# u9 J% t* _, C0 r2) Now, the owner discovered that the 100 bucks is fake. You can th ... & w- x/ ? V# K
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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。" H: [' I! @- [! W9 S: D/ l1 a
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
9 h6 j, Q/ s& S% d 公仔箱論壇, }; ~/ R; x1 c( c* c; A5 N# J
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.公仔箱論壇 k! \. U7 K) n1 A: h+ v
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。/ i/ u6 c1 _; `; A' b% _! q
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |