The productivity of a country in South America is given by the function f(x, y) = 40x⁴/⁵ y¹/⁵, when x units of labor and y units of capital are used. (a) What are the marginal productivity of labor and the marginal productivity of capital when the amounts expended on labor and capital are 243 units and 3125 units, respectively. (Round your answers to two decimal places.)