The productivity of a certain country with the utilization of x units of labor and y units of capital is given approximately by the function f(x,y) = 100x0'74y0'26. (A) Find fx(x,y) and fy(x,y). (B) If the country is now using 400 units of labor and 500 units of capital, nd the marginal productivity of labor and the marginal productivity of capital. (C) For the greatest increase in the country's productivity, should the government encourage increased use of labor or increased use of capital