原帖由 prozzy 於 2007-5-18 23:05 發表。 5.39.217.76' l3 ?1 F( l+ H g2 l
the answer is -$97 for sure. ! U5 U7 B) t! ?! K
Think about it this way
, R% n1 i3 N. h: s* C6 P& H" C" {0 c8 wtvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.76, {( M- _7 O: b2 B- i6 `
2) Now, the owner discovered that the 100 bucks is fake. You can th ... & [7 n( E& q) y) g! O
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong公仔箱論壇' X( m$ P7 T( y
$ |- V, n0 V0 C( H4 P5 U ?5.39.217.76think 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.tvb now,tvbnow,bttvb7 E. y0 W3 b: j: Y% B
& M& J5 x. |5 T) v. ~tvb now,tvbnow,bttvbI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |