原帖由 prozzy 於 2007-5-18 23:05 發表。 5.39.217.76' A) B# h/ A6 Y; _* v& n% L
the answer is -$97 for sure. tvb now,tvbnow,bttvb3 L0 J: `" I" n+ A: A8 K b/ N* E
Think about it this way
5 o3 |& m8 f( x7 L6 Gtvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.76; g3 ]% b8 z3 i1 v5 Y2 H5 E7 H
2) Now, the owner discovered that the 100 bucks is fake. You can th ... / Q6 |7 `4 B7 _ l" g" w
* U1 i; N; Q$ Z2 o5.39.217.76 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。9 U/ N' g3 F$ P9 e% H' f
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongtvb now,tvbnow,bttvb' k Q! J0 t- u$ z1 W( b$ K
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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.
3 v" X" E% t) Y3 M* o- X0 pTVBNOW 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。
6 m% M; c3 `: |1 r S公仔箱論壇I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |