原帖由 prozzy 於 2007-5-18 23:05 發表。 
4 Q4 E* p1 L. K. V9 o4 X5 Ftvb now,tvbnow,bttvbthe answer is -$97 for sure. 3 e3 a) V$ y+ W! G' g
Think about it this way
, q9 @7 P$ e2 g8 O+ Ctvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.76$ h8 q6 K& N( j! O ]: p
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 8 q& ]* K7 b' M, g+ d
?& @8 Z; ]8 |% F! l- T l |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。
( I5 V c. a- e/ g* n9 g4 P5.39.217.761) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
4 ~8 ~$ U" f, {3 M: \tvb now,tvbnow,bttvb / L+ s+ w- ?2 k/ A" K( v: W
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.5.39.217.76: [0 F- k7 s8 N5 F. d ~
- d3 Y: W' H1 L8 \I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |