原帖由 prozzy 於 2007-5-18 23:05 發表。 公仔箱論壇 j* x% P4 f: L% F8 {- B7 N
the answer is -$97 for sure. 1 X) Y4 B" U; _- h7 {$ e
Think about it this way 6 N) m, E1 [+ F( I0 ^: g! i
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)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。6 b0 S: v. T2 x7 c
2) Now, the owner discovered that the 100 bucks is fake. You can th ... , r0 O3 j, j' b( g' w3 `, }公仔箱論壇
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+ E; S4 }# J' Z5 t5.39.217.761) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
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1 @% a& R* v N8 a9 q/ eTVBNOW 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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* N: O" h% S6 E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. |