原帖由 prozzy 於 2007-5-18 23:05 發表。 
, m" [6 W7 s, u8 j1 l& e5.39.217.76the answer is -$97 for sure. tvb now,tvbnow,bttvb& C. \: ]4 Q' _( ~, ]/ J4 d
Think about it this way
& P0 v0 m. N& J5 }+ _1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb0 u' _4 _) M/ u3 q: X
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 1 \. A: r, ^1 w* ?/ q* u+ p公仔箱論壇
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9 u. Q$ y! K! q. m0 Y1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong3 W5 O, j5 b- f O& @
* T9 N6 g c' u' _1 i+ b! \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5 {: m C, v/ ~/ h& }! Q" e( N
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I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |