原帖由 prozzy 於 2007-5-18 23:05 發表。 
/ U1 a: U" K' y- \+ \9 bthe answer is -$97 for sure. tvb now,tvbnow,bttvb8 F/ |1 Y u, L* C, f" w
Think about it this way ( n" V( C4 E; A8 u
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)) n7 {; L/ Y: p7 i" D) N8 v
2) Now, the owner discovered that the 100 bucks is fake. You can th ... & k% N7 A+ ~$ b9 t公仔箱論壇% w& Y# f+ j J, N1 R; {$ T
. S8 J! W& U% T& k' N: Jtvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
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4 {1 F, i& X2 G9 ~3 M- M. v6 Gthink about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.5.39.217.766 {7 ~4 L: L4 R
, x9 H) c$ b( sTVBNOW 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。I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |