原帖由 prozzy 於 2007-5-18 23:05 發表。 
5 ~* L _( x( U+ ?, _公仔箱論壇the answer is -$97 for sure. 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。9 s! X% r/ f3 a- Q8 q
Think about it this way
7 }% T) Z# r% k4 k1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
2 n; f6 w! X: ]0 a! Mtvb now,tvbnow,bttvb2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5 r+ t# m1 y5 j4 S) V3 R公仔箱論壇$ O' b7 S3 R+ k: y' V
9 {6 d4 R& d8 G( K# d7 s5.39.217.761) 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。% o% Q1 z' L6 B" i
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think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
7 O7 C7 p) h0 ?$ X* V7 b# vTVBNOW 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。 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。% m5 m& l$ n4 v, r
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |