6x - 1 The total cost (in hundreds of dollars) to produce x units of perfume is C(x) = 9x +4 (a) Find the average cost function (b) Find the marginal average cost function (c) Find the average cost and the marginal average cost for a production level of 5 units. Interpret your results (a) The average cost function is C(x) = (b) The marginal average cost function is C (x) = (c) The average cost for 5 units is $ per unit. The marginal average cost for 5 units is $ (Round to the nearest cent as needed.) Interpret your results When 5 units are produced, the average cost is $ |per unit and the average cost is at a rate of about $ per unit. (Round to the nearest cent as needed.)