原帖由 prozzy 於 2007-5-18 23:05 發表。 * d& _+ m1 ~0 R" M# i
the answer is -$97 for sure. 公仔箱論壇2 F3 E( q% v. m. k
Think about it this way
- N* P2 R5 U7 H0 N& M" P1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18); b* l6 g( V: d. `+ k. f
2) Now, the owner discovered that the 100 bucks is fake. You can th ... * k! Q! u& a5 k# L
% F, [' h& r9 l& _" fTVBNOW 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! B8 D* G/ {5 e0 ?: H, ^" ?
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong4 a8 F3 @. {+ |& P' ]5 l
8 C* k) D }% ^' f) htvb now,tvbnow,bttvbthink 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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' ]5 z. e8 m4 W. qI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |