E. Related Rates 133 surface area A of a closed right-circular cylinder radius r and height h is given by A = 2m2 + 2min. The radius r is increasing at a rate of 50mm/minute and its height is decreasing at a rate of 30mm/minute. How fast is the surface area A changing at the instant when its radius r = 80 mm and h=120mm? (Express answer in terms of Ti?)