原帖由 prozzy 於 2007-5-18 23:05 發表。 5.39.217.76/ R2 }- O1 {& n8 q% K1 w/ A+ O; u9 d
the answer is -$97 for sure. " \& G7 J' k7 z K
Think about it this way
. m, P9 E; H3 O! `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) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
. |0 p6 O- Y3 L5 c/ v1 b& Q公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... tvb now,tvbnow,bttvb* p- r* K+ u$ S2 i5 }
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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
; [& O& N: p9 F) ]# ~% L# [2 XTVBNOW 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。
: n# Q B9 T8 }6 Y) P2 Uthink about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.tvb now,tvbnow,bttvb: ]+ k( r4 r1 W4 V0 o, w$ ]
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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. |