63.A telephone company in a town has 500 subscribers on its list and collects fixed charges of 300 per subscriber. The company proposes to increase the annual subscription and it is believed that every increase of 1 one subscriber will discontinue the service. Find what increase will bring maximum revenue?

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A telephone company in town has 500 subscribers on its list and collects fixed charges of 300 per subscriber per year. The company proposes to increase the annual subscription and it is believed that for every increase of 1, one subscriber will discontinue the service. Find what increase will bring maximum profit.

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