原帖由 prozzy 於 2007-5-18 23:05 發表。 
: u; ~' m" q$ X* f4 w7 ~the answer is -$97 for sure. ( N! X- E' y' v" T, _
Think about it this way # E) V+ G9 _* v0 A: i. @
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
& W/ n+ \, I, U: Z& S# @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) Now, the owner discovered that the 100 bucks is fake. You can th ... 4 o+ W" v8 F! _# I, dTVBNOW 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。6 K8 }( y& J+ {/ g- }
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。4 \$ l6 ?! i' e) P* q* h/ y; O
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
5 \ s- ^+ p4 @. n9 t0 [4 ^4 ZTVBNOW 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。 % |1 q/ x; N8 ~" |
think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
, @$ D4 W4 D, ktvb now,tvbnow,bttvb tvb now,tvbnow,bttvb: c0 \. @7 `7 i/ T! ^
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |