原帖由 prozzy 於 2007-5-18 23:05 發表。 8 @' m: |. [5 }* l& M" Y
the answer is -$97 for sure. 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。9 }) U% n7 G0 @0 J/ T
Think about it this way
! C9 P: ~0 j% Ztvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)8 ^0 i% j9 @. k/ S* o- ]* o% T
2) Now, the owner discovered that the 100 bucks is fake. You can th ... ( g5 u# J" Z/ l( D6 D7 A' Htvb now,tvbnow,bttvb公仔箱論壇9 o3 j" l: y) A$ a4 ^
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongtvb now,tvbnow,bttvb! `2 B' \7 F2 S2 d( m4 q8 w
# l0 F! D3 R% HTVBNOW 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 $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.5 A. |* f$ l+ J
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。8 N0 z* ~ |- t9 Y V
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |