- Marginal Analysis & Elasticity Course Packet on marginal analysis The daily cost (in dollars) of producing LG ultra high definition televisions is given by C(x) = 5x3 - 30x2 + 60x + 1600 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 4000 televisions have been produced