What's your answer for this functions question
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What's your answer for this functions question

[From: ] [author: ] [Date: 12-07-05] [Hit: ]
Thank you.-http://ca.answers.yahoo.......
an electronics store sells an average of 60 entertainment systems per month at an average of 800$ more than the cost price. For every 20$ increase in the selling price, the store sells one fewer system. What amount over the cost price will maximize revenue?

I found the vertex to be (10, 50000) but I can't get what it means. Please answer and explain. Thank you.

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