原帖由 prozzy 於 2007-5-18 23:05 發表。 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。# w+ U: y9 l( ]
the answer is -$97 for sure. 3 i* X2 c* `8 t/ w" r5 X1 W
Think about it this way " y) h* T/ z4 _0 [( z
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb4 ]- A! r5 Q: C
2) Now, the owner discovered that the 100 bucks is fake. You can th ... TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。* @2 `5 T n y9 M2 m+ @1 x
tvb now,tvbnow,bttvb- H) T7 Y5 B/ h; M! B5 Y4 E, |) k- Q
4 M5 p+ o) h/ n# z* Ktvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
. A1 Y0 i# a$ c + ^) o/ ^& F$ j) s2 c
think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
+ D$ z$ R/ N5 z5 e6 j公仔箱論壇 9 E% J/ X7 o, o) j. U
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |