原帖由 prozzy 於 2007-5-18 23:05 發表。 
1 d, J; `) E. m/ [4 H) L" ]9 M- W, vtvb now,tvbnow,bttvbthe answer is -$97 for sure.
4 X Y' i2 s( Q7 U5.39.217.76Think about it this way }, i! B4 g" R$ B3 i3 d
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.768 l$ l7 a4 L" x G* H8 u# t
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 8 R2 t8 K& Z1 X/ S5.39.217.76
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8 N4 n. O+ e0 S# T- D# {1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong* R- E, f3 ~1 {4 I8 W
+ Q/ N# K5 t2 o9 B" m6 M9 L5.39.217.76think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.tvb now,tvbnow,bttvb- I) b3 L- i2 l8 E6 Y
tvb now,tvbnow,bttvb3 N5 h$ P" E9 t' T/ ?! ^, I4 a
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |