原帖由 prozzy 於 2007-5-18 23:05 發表。 
. y2 j/ E0 D" `8 Eos.tvboxnow.comthe answer is -$97 for sure. # b& |- g) ?5 U B. @
Think about it this way 1 s; z: a7 o3 m" r# A4 s! d
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb& F2 ]: u7 g2 N) }/ A. z" J
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 0 j- X$ r0 k/ Q. _" T0 }+ N4 Y4 zos.tvboxnow.com6 }; H7 }( F: a
' A# c0 ]; i p2 Y1) 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。: y. C1 _- G+ T" O2 `
u% c: G7 V' P. {& t公仔箱論壇think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
, m' ^# |$ y* u& d# X) @% ~, Mtvb now,tvbnow,bttvb 公仔箱論壇; t7 {: z" c6 D6 H z0 I
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |