原帖由 prozzy 於 2007-5-18 23:05 發表。 tvb now,tvbnow,bttvb+ I2 a" o/ c* W
the answer is -$97 for sure. 公仔箱論壇; P! P' r4 b6 M; h; |
Think about it this way
$ ^8 o& R% w2 y: x$ xtvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
( h8 j7 X0 Q- `5.39.217.762) Now, the owner discovered that the 100 bucks is fake. You can th ... 公仔箱論壇, e0 p' R$ b6 S9 ~3 X& I
TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。8 I* C1 f" ]9 f. ^) m ^
2 K) E2 f7 @* w1 R' P, M6 |7 b1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong2 S1 } _2 Y% F. n# G
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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.5.39.217.760 R" t1 b# q! D: P l, t; P' e
5.39.217.76. A9 s; H8 [: k& i- [) J6 }2 Z/ {
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |