原帖由 prozzy 於 2007-5-18 23:05 發表。 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。/ ^8 @- k" u& L, ~+ o( }- W
the answer is -$97 for sure. * d0 I+ i7 l; R" @8 ?' }& c- e
Think about it this way
- T/ p% o: h1 y, g0 m3 D1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb* m [7 g+ p1 w, y7 [7 Q# @' H
2) Now, the owner discovered that the 100 bucks is fake. You can th ... ) ?# \7 m0 Q8 T9 f4 v
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
: v5 w- k* h3 i9 d: Y3 O- t6 i+ sTVBNOW 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。 公仔箱論壇1 }( Y% ^6 @. V8 ^, D9 p4 d4 L f. q
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.tvb now,tvbnow,bttvb. m' \( g! u& V% _( E; e% G3 h( O/ J
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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. |