原帖由 prozzy 於 2007-5-18 23:05 發表。 
' t$ {7 H# l1 m1 S" ~, z2 t( W: `the answer is -$97 for sure. % o, h6 x! [" L: P1 k/ J
Think about it this way 公仔箱論壇+ m! m% I c0 {3 f8 R! V7 |
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
- u, g( y# Q, `3 z5.39.217.762) Now, the owner discovered that the 100 bucks is fake. You can th ... 9 S2 I! q3 _4 j& Z- \5.39.217.76公仔箱論壇5 V/ v) c7 y/ K) X3 Z
9 s9 D; J6 r0 i
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
+ i2 z2 x: n" s$ C
/ J" Q) r& A% R' z/ z' ]5.39.217.76think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.tvb now,tvbnow,bttvb, m) O9 `/ G' }7 V' C
5.39.217.76+ i* F A; G$ P3 M
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |