原帖由 prozzy 於 2007-5-18 23:05 發表。 
! R; Z; j* @" K公仔箱論壇the answer is -$97 for sure.
; T1 c% F% b) C3 c% _! QThink about it this way 5.39.217.765 H' f1 r0 O* ~' J/ r
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.76% l k" Y# W% T9 Z$ H- t
2) Now, the owner discovered that the 100 bucks is fake. You can th ... $ D8 @" s7 x' |# Q. |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。
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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 wrong
& y2 [' I% \8 d; N) V' R; _7 J, C/ ^, k+ U5.39.217.76 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。0 `/ Q5 |+ [+ z- P
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.
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I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |