原帖由 prozzy 於 2007-5-18 23:05 發表。 , V# d' S, x( Z4 D8 n
the answer is -$97 for sure.
i' O1 r' ^! ]4 @# {Think about it this way + X: f, d5 }* v0 `+ V& X: r
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
: ?5 o1 M: ?6 ?9 D; E: {2) Now, the owner discovered that the 100 bucks is fake. You can th ... 3 g) W4 d) A; ^: b7 S9 v# Mtvb now,tvbnow,bttvbtvb now,tvbnow,bttvb" m G Z0 f7 I) R) T5 X
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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 wrongtvb now,tvbnow,bttvb2 `9 F+ ~0 s+ Y% g( y' V+ Z1 j3 o! x
公仔箱論壇- Y4 X0 `7 h% r6 g8 Q& F
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.
- {; b1 y0 r5 O" h/ M3 T, I5.39.217.76
- g1 k! H# Y& j( @, ~: e1 _I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |