The Total Daily Profit (In Dollars) Realized by Weston Publishing

Short Answer

The total daily profit (in dollars) realized by Weston Publishing in publishing and selling its dictionaries is given by the profit function
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where x stands for the number of deluxe editions and y denotes the number of standard editions sold daily. Weston's management decides that publication of these dictionaries should be restricted to a total of exactly 400 copies/day. How many deluxe copies and how many standard copies should be published each day to maximize Weston's daily profit?
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Find the number of deluxe copies.
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Find the number of standard copies.