原帖由 prozzy 於 2007-5-18 23:05 發表。 1 \7 X8 F! I; h0 M7 V e
the answer is -$97 for sure.
0 W( M9 n8 p0 h& \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。Think about it this way tvb now,tvbnow,bttvb6 l! s2 x2 C( v5 u# J7 ^# L3 |; q
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
7 _6 G: E6 n8 S+ p2) Now, the owner discovered that the 100 bucks is fake. You can th ... www.tvboxnow.com6 g0 ~0 c; t f5 y4 x: X v; Q
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。" W8 z$ x, j. d1 `1 `
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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.& N6 U1 S# V9 R! m, u
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。1 B0 p/ F) E5 U
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |