n can manufacture a product according to the production function: L,L) = K3/4L1/4. ate the average product of labor , APL , when the level of capital is fixed at 81 units and uses 16 units of labor. In :Round your responses to 3 decimal places . the average product of labor when the firm uses 256 units of labor '2' an expression for the marginal product of labor , MPL , when the amount of capital is 81 units . n :The second response is the exponent on L in the expression .Round your responses to 1 places . *LA lustrate that the marginal product of labor depends on the amount of labor hired by ing the marginal product of labor for 16 and 81 units of labor. n :Round your responses to 3 decimal places . hen L 16: hen L 81: se capital is fixed at 81 units . If the rm can sell its output at a price of $200 per unit hire labor at $50 per unit , how many units of labor should the firm hire in order to profits