原帖由 prozzy 於 2007-5-18 23:05 發表。 
( S* I+ V* i( k& c2 P0 o. l9 Qtvb now,tvbnow,bttvbthe answer is -$97 for sure. 1 y0 t, \, d+ W5 w9 b& g
Think about it this way
* o; I; D1 }6 h/ X5 b! U公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)' k3 r. J3 R2 B
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5.39.217.76! ~2 w3 k6 |+ z7 D7 K: F
9 ^" }" y/ E) K& H4 S. e5 `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。 5.39.217.76, J* S5 B. v ]+ R( T l6 w& p% i
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.76% l8 a v3 [! u: U/ y" M
$ y, M; m/ r X5.39.217.76think 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.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。( c! ^8 u+ E3 \+ o
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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. |