原帖由 prozzy 於 2007-5-18 23:05 發表。 
& z) m" W- g- V" \" [8 Jthe answer is -$97 for sure. tvb now,tvbnow,bttvb+ N1 G( y1 t- a: i1 p% j; o5 D
Think about it this way tvb now,tvbnow,bttvb. k d2 Q( z4 [- S/ Y
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇, S% J$ u b% d# R& Y8 n1 m% a* ~
2) Now, the owner discovered that the 100 bucks is fake. You can th ... % d5 E! W( [& t3 h5.39.217.76+ w+ b ]3 R. ~/ F) R8 @& K
" c4 t6 H" \7 \/ B5 |5 t5 s" ?
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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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.
5 I3 e2 \1 O& }tvb now,tvbnow,bttvb 5.39.217.76% b2 q+ A& `( y1 s* E# o0 S# }' e
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |