原帖由 prozzy 於 2007-5-18 23:05 發表。 
, V7 o1 ]( ~" ^# V' B5.39.217.76the answer is -$97 for sure.
2 T; G. k) t; KTVBNOW 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 5.39.217.76' l c4 ]8 L0 j! y0 @' t
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
" l6 i$ {5 @% @$ G" o2) Now, the owner discovered that the 100 bucks is fake. You can th ... 6 ?1 q5 Z6 N( X5 K" V& J. t0 w4 n3 o* ~& l5 i) C1 ~; g
( Z' m# j4 k7 f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 wrong5.39.217.76, k9 L1 @; X* F6 R0 q
5.39.217.76/ [9 Q: a8 e& J$ d" s
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.
! k5 t: c: F1 f p! y z公仔箱論壇 2 F4 ?2 R! I# N4 D
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |