原帖由 prozzy 於 2007-5-18 23:05 發表。 
8 |9 ~& s' u! V9 f6 ?公仔箱論壇the answer is -$97 for sure. 5.39.217.76" @/ i- n' \6 o% L4 `# J
Think about it this way
) K G/ M+ k7 _- I, k$ \5.39.217.761) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb; R: V: f, C! x8 }
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 2 |. F( _' O7 L! \) B4 {1 D7 D4 U1 `, J8 _9 u! d V
tvb now,tvbnow,bttvb5 Q$ X0 H. e8 _% Q. o( M
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
% i* }0 p& I9 g# Y- j+ P4 ^ gtvb now,tvbnow,bttvb
" P- _/ b/ }6 ~0 x公仔箱論壇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.
4 g2 Y- c/ A; btvb now,tvbnow,bttvb ) |& Q; m9 t% N% K% z9 R
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |