原帖由 prozzy 於 2007-5-18 23:05 發表。 
4 W" p- g( n1 F6 j. l( u6 pthe answer is -$97 for sure. ) O; C/ f; y _1 B" F
Think about it this way tvb now,tvbnow,bttvb/ i9 i* @6 m9 w7 ^' E
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb# ]% s% p) L" g6 u
2) Now, the owner discovered that the 100 bucks is fake. You can th ... ( c2 j8 ?* _) J# f( D( j: ~tvb now,tvbnow,bttvb5.39.217.76/ P- O5 r8 ^0 L- G% T4 b9 E
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong$ i) ?5 y. m4 J+ {' b$ C0 _
R8 E! Z: M* s y) P. C9 STVBNOW 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。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.
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I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |