A firm's weekly profit P (in dollars) in marketing two products is given by 2 2 P - 200x1 + 58032 - z, -5x -2x129 - 7500. Where z, and zy represent the numbers of units of each product sold weekly. Estimate the average weekly profit when z, varies between 40 and 50 units and zz varies between 45 and 50 units.