原帖由 prozzy 於 2007-5-18 23:05 發表。 公仔箱論壇8 J( u/ W' _, Z* |/ v
the answer is -$97 for sure. & K* q' n% B$ }7 u$ q; N
Think about it this way
" d! @8 u; }/ e" b5.39.217.761) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
; Y$ [* H( W: }# S! S公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... 公仔箱論壇 D, l% U6 d4 e4 c' A, k0 |* X. y
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3 h( Q8 q! w/ c" \0 n: }' ^; gTVBNOW 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) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong" C# s9 H: Q6 L0 i
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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.0 R v& z5 o& \/ [+ s
. {- [% @; n9 U5 _公仔箱論壇I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |