原帖由 prozzy 於 2007-5-18 23:05 發表。 
) L7 D8 U* z2 Q, V% r/ l3 E1 [公仔箱論壇the answer is -$97 for sure.
2 o) R+ S9 A& }公仔箱論壇Think about it this way
) w6 i" E' K" i2 o公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
2 K3 c+ R3 ~- J }TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。2) Now, the owner discovered that the 100 bucks is fake. You can th ... 公仔箱論壇4 C# Y9 y1 ~0 n- i& y, D
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong$ H- l4 u2 [7 | S* ]. v9 Q
7 B/ [( n/ x% j! A5.39.217.76think 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.
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7 E- y& w) s! d; M c1 [, j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. |