3. (10 Points) We will again use the same function from the previous problem - The multivariable function C(x, y) = 431787.4 - 116.8x + 0.1x2 - 14.5y + 0.05y gives the cost, in dollars, for a company to manufacture x steel construction beams and y electrical panels. a.) Find and interpret the meaning of C(1000, 500). b.) Compute Cx (1000, 500). Interpret the real-world meaning of your answer. c.) Compute Cy (1000, 500). Interpret the real-world meaning of your answer d.) If the company currently manufactures 1000 steel construction beams and 500 electrical panels, is it cheaper to manufacture another steel construction beam, or to manufacture another electrical panel? Explain how you know