The daily cost (in dollars) of producing LG ultra high definition televisions is given by C(x) = 4x3 - 40x2 + 80x + 900 where x denotes the number of thousands of televisions produced in a day. (a) Compute the average cost function, C(x). C(X) = (b) Compute the marginal average cost function, C'(x). C'(x ) = (c) Using the marginal average cost function, C'(x), approximate the marginal average cost when 3000 televisions have been produced