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The profit (in thousands of dollars) from the sales of graphing calculators is approximated by P(x,y) = 400 - 9x + 18xy - y, where

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The profit (in thousands of dollars) from the sales of graphing calculators is approximated by P(x,y) = 400 - 9x + 18xy - y, where x is the cost of a unit of chips and y is the cost of a unit of labor. Find the maximum profit and the costs of chips and labor that produce the maximum profit. The maximum profit is $

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