原帖由 prozzy 於 2007-5-18 23:05 發表。 5.39.217.769 b2 g1 _7 ~. A
the answer is -$97 for sure. . m, d8 d/ C8 ?, N, Y% T
Think about it this way K; e& R6 I3 x' ]" i7 H
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
) f, }7 r; o3 v! V3 w0 Mtvb now,tvbnow,bttvb2) Now, the owner discovered that the 100 bucks is fake. You can th ... # B/ _. C" T) |* a公仔箱論壇
: \8 T+ R+ h* n! H 公仔箱論壇. u1 X' C2 F. L
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
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( ^2 e0 u. N/ g- _9 ~' n5 P, r( \+ X& Ftvb now,tvbnow,bttvbthink 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.5.39.217.76( m6 E+ k4 D- a( S9 \
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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. |