原帖由 prozzy 於 2007-5-18 23:05 發表。 ) _2 R. \( W' k8 t
the answer is -$97 for sure.
/ U9 J3 q- q. N$ GTVBNOW 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。Think about it this way - T( _% B, n, A
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
& e( S& Z* E& P& m; v* r z) Z* w3 c7 s2) Now, the owner discovered that the 100 bucks is fake. You can th ... 8 T2 v' E- v9 F' Q: x: u- B {TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。2 V! S1 Y4 h" e, B9 p0 w6 k
& N$ n& r( y7 f# t1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.765 @5 Q$ Q& n& b5 M& v q
, k* b+ }1 |; E7 f8 O; k" nTVBNOW 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。think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.7 g9 V9 W$ J+ d9 q
- C& y. Y1 }5 ?% g公仔箱論壇I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |