The total revenue (in hundreds of dollars) from the sale of x spas and y solar heaters
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The total revenue (in hundreds of dollars) from the sale of x spas and y solar heaters is approximated by R(x, y) = 15 + 169x + 182y - 5x2 - 7y2 - 7xy. Find the number of each that should be sold to produce maximum revenue. Find the maximum revenue.
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