The daily cost (in dollars) of producing LG ultra high definition televisions is given by C(x) = 4x3 - 40x2+ 80x + 2500 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 5000 televisions have been produced