The total revenue (in hundreds of dollars) from the sale of x spas and y solar heaters is approximated by R(x,y) = 16 + 329x + 275y - 8x² - 6y² - 11xy. Find the number of each that should be sold to produce maximum revenue. Find the maximum revenue. Find the derivatives Rxx, Ryy, and Rxy- Rxx= -16, Ryy = -12, Rxy = -11 Selling spas and solar heaters gives the maximum revenue of $ (Simplify your answers.)

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