原帖由 prozzy 於 2007-5-18 23:05 發表。 
' a2 K8 G2 U3 }- _; l% s* m& u5.39.217.76the answer is -$97 for sure.
) z) ]4 ]& a8 _" Q. @公仔箱論壇Think about it this way 7 J) h) b& ?( f( R
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
- J) c- g/ W \+ Z3 o# atvb now,tvbnow,bttvb2) Now, the owner discovered that the 100 bucks is fake. You can th ... " a6 ~& i0 v- q4 ?4 D7 m1 y公仔箱論壇
) ?. }1 ]! A9 I) [, N X4 Z5 @; ^. `5.39.217.76 tvb now,tvbnow,bttvb H+ ?& r# Q3 p2 P' N6 r" g
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.762 C1 f$ V( a# [; b. b" R
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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.tvb now,tvbnow,bttvb1 y) A" c8 q G/ f4 L
, d/ n) Q1 y; a1 o2 X公仔箱論壇I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |