原帖由 prozzy 於 2007-5-18 23:05 發表。 
) E9 D6 o# w; G9 |8 Htvb now,tvbnow,bttvbthe answer is -$97 for sure. tvb now,tvbnow,bttvb. ~' \# L: I' n3 S. N. z6 l& E
Think about it this way & f0 K" u5 f0 }- Q- o( E! |; Z3 t
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
b+ a$ H+ r5 g9 b+ U2 X& b, DTVBNOW 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。2) Now, the owner discovered that the 100 bucks is fake. You can th ... 6 i8 X6 C6 P% N9 u/ ytvb now,tvbnow,bttvb
" I# v0 H) G. |$ l3 B6 a0 }- s5.39.217.76
( z# K$ b+ V9 }1 L2 s1 a7 [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。1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
5 B2 W3 v3 A: K% x# y# _tvb now,tvbnow,bttvb
6 C% K# U- X" t- `+ w( Y: sthink about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.: I$ R: {% |! j7 X& k/ u
! D( B( G8 O# X! pI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |