原帖由 prozzy 於 2007-5-18 23:05 發表。 tvb now,tvbnow,bttvb, H- h) T) o" i5 K. u1 _
the answer is -$97 for sure. 2 {( D1 w; }$ d( f; I
Think about it this way 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。) W1 \6 j: ~! c" q
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
! k7 O9 T0 q2 y5 G1 `2) Now, the owner discovered that the 100 bucks is fake. You can th ... , L) f, y7 U) S3 b- n2 y
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+ z$ e; Y: l4 b1) 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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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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I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |