原帖由 prozzy 於 2007-5-18 23:05 發表。 
9 g! T; _& a0 m* f7 p+ | S1 R5.39.217.76the answer is -$97 for sure. 5.39.217.76% v1 J `. ]- _& w; {! R; F1 h
Think about it this way
3 \3 F8 f, q" d5.39.217.761) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)+ ?8 h4 a% v' X% b( q
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 9 Y; n+ I+ `8 X' z/ Y! p+ f! I5.39.217.76
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& @ `% q: `4 G) h$ Z& _$ Z1) 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! K; o! p* n2 q$ s r1 ^
( F& E& r' J7 z" t1 a0 v: G) B5.39.217.76think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
4 S* f& m' x7 l o( U公仔箱論壇 5.39.217.760 m5 ?. T! }& U% |$ z l8 G& {
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |