原帖由 prozzy 於 2007-5-18 23:05 發表。 tvb now,tvbnow,bttvb! f) g' `$ z# ]& n6 _* I2 Q
the answer is -$97 for sure. www2.tvboxnow.com! B9 ^' J ^: u
Think about it this way
# [1 A7 B( ~; Ntvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
) l" P" w! r* \TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。2) Now, the owner discovered that the 100 bucks is fake. You can th ... tvb now,tvbnow,bttvb/ h& b: Q p$ n
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" E$ h/ r9 @9 J! g1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
! n) E0 b1 @- q7 E公仔箱論壇 tvb now,tvbnow,bttvb. A$ p/ B; |+ C5 Q" M5 {
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.! N+ K T! p3 k1 E- c
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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. |