原帖由 prozzy 於 2007-5-18 23:05 發表。 5.39.217.77+ W: a: n" d3 u$ Z# Z
the answer is -$97 for sure.
9 g1 B9 S9 \2 u8 B5.39.217.77Think about it this way 5.39.217.77% y' H; m( u/ ~
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)8 h9 q% H1 v: E" {9 K
2) Now, the owner discovered that the 100 bucks is fake. You can th ... : x0 z1 d: S! P& H1 a4 w
, P H& ]/ H* f: c5 cTVBNOW 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。
. x. \# z- G2 h. x' n+ z公仔箱論壇1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongTVBNOW 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。! u: ~% y+ @# B) W0 [5 _
" y! n6 k; f% M/ x. C" h公仔箱論壇think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.5.39.217.77. o5 G: ^/ _2 I
& d5 ~2 o$ Z# Z; ^# ZI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |