原帖由 prozzy 於 2007-5-18 23:05 發表。 
# T/ {- T% C( R3 L$ n4 s% i公仔箱論壇the answer is -$97 for sure. tvb now,tvbnow,bttvb: m4 I5 _& u/ b7 w' d; L% ?, k
Think about it this way
& Y- o1 S: i& |/ C1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
( h; G: D0 J1 _% S% n- {公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... 6 g) L2 c% c1 P0 ?' 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。tvb now,tvbnow,bttvb: S, d o# X: m) e( G0 h: d
* {/ r1 r! a) [9 v& D- d# h5.39.217.761) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong- J1 F( K \) o
! [* P9 F1 N, X: y* H$ w公仔箱論壇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.公仔箱論壇. \ `& E8 L4 w5 i# p8 G3 }/ x( ]- m7 [2 `
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。" M& r0 S( O: y4 S
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |