原帖由 prozzy 於 2007-5-18 23:05 發表。 
' N/ G8 g. Z( W$ W0 ~/ Z公仔箱論壇the answer is -$97 for sure. tvb now,tvbnow,bttvb9 ]" x' h% s; A3 k+ F
Think about it this way
! e4 m2 M4 r. ?) o; `) stvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
% L, ~6 H( s& j9 Y4 @5 o2) Now, the owner discovered that the 100 bucks is fake. You can th ... . J. `0 y* C- k" T: I/ X, R: e2 btvb now,tvbnow,bttvb
1 }, O+ j" x' _/ f5 Utvb now,tvbnow,bttvb 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。5 q6 r8 b C. }( b( v% t! Z
1) 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。0 P# N/ |5 T- {) @ w d8 u
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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- A2 g) N1 R5.39.217.76
; u' j/ x4 \! J p2 Y: |% j9 _) KI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |