原帖由 prozzy 於 2007-5-18 23:05 發表。 2 ~+ M- X M4 Q, H# |0 r% n( F
the answer is -$97 for sure.
C2 U# n2 I; |. t fThink about it this way % c8 n. S6 Z. x
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
! p# o9 y3 ^0 M" [2) Now, the owner discovered that the 100 bucks is fake. You can th ... : @8 Y6 D; a( _8 E/ u& N3 @& ?' Z- mtvb now,tvbnow,bttvb
: w4 T. P* i' {4 GTVBNOW 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。
% V1 K' A j8 S- [8 P& jTVBNOW 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。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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2 C6 U0 q" J8 {- g9 T. wTVBNOW 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。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.* o- K. c2 |8 ^9 U6 P. A5 G
$ O2 F4 X6 g$ u( O* X# wI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |