原帖由 prozzy 於 2007-5-18 23:05 發表。 
$ T0 l9 v$ y" F8 n$ d- R$ n; RTVBNOW 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。the answer is -$97 for sure. 6 W* ]) h+ f Y3 E0 I0 N" x; M1 H5 v$ P3 O
Think about it this way 公仔箱論壇* t- O- o6 K" H) J, I5 J
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。9 q& g' x9 `1 v8 R( i
2) Now, the owner discovered that the 100 bucks is fake. You can th ... ; o; x( e; }; rtvb now,tvbnow,bttvbtvb now,tvbnow,bttvb& q% l! V: o" \
TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。3 w5 S. _$ z/ E! d+ p
1) 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 $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
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) I& Z9 t& Q* c$ qtvb now,tvbnow,bttvbI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |