原帖由 prozzy 於 2007-5-18 23:05 發表。 
' Z& }# w, T+ I* x- ~7 cthe answer is -$97 for sure.
: k! Y7 \) n! d4 y( l5.39.217.76Think about it this way 5.39.217.76" S# ~8 U, b- M7 H0 {: ] d
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇; E7 j. w2 m2 g$ }- ]' ]
2) Now, the owner discovered that the 100 bucks is fake. You can th ... G5 s5 b6 y- n, @5.39.217.76
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8 h3 r; [1 n! h) J% A! H) qTVBNOW 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。1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong公仔箱論壇7 p. c! R# i' S& i- m. Y
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think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.5.39.217.763 F+ S* [9 j3 d: l8 F9 q2 c2 G, @) j
3 o' t& H# P$ f0 A, P3 AI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |