原帖由 prozzy 於 2007-5-18 23:05 發表。 ; ]' p, \1 _1 @0 U5 o& _4 Z
the answer is -$97 for sure. $ b6 O3 z- p% y6 G4 z
Think about it this way tvb now,tvbnow,bttvb) D. ~3 w2 b( g
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
& g7 n- b, P4 P& a5.39.217.762) Now, the owner discovered that the 100 bucks is fake. You can th ... ' r9 _- l: U# p* P; b
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) B1 G' D& C- a$ p, P$ b! N O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% h" C) A/ ^8 y+ o6 T2 |5 T( W4 _
8 R6 M9 E3 W$ {. w0 O( 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.tvb now,tvbnow,bttvb0 ~: O' O& ?( i8 R9 ~ f) }% X7 s; ]
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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. |