Consider the following cost function. a. Find the average cost and marginal cost functions. b. Determine the average and marginal cost when x = a. c. Interpret the values obtained in part (b). C(x)=0.02x +0.8x + 30x + 120, 0x 1500, a = 800 a. The average cost function is C(x) = .02x + .8x+30+ 120 X The marginal cost is function is C'(x) = .06x +1.6x + 30. b. The average cost when x = a is $ 13,470.15. (Round to two decimal places as needed.) The marginal cost when x = a is $39710. (Round to two decimal places as needed.) c. Choose the correct interpretation of the average cost when x = a. O A. The cost of producing the 801st item is about $39,710.00. B. The cost of producing 800 items is about $12,270.15. OC. The average cost per item is about $13,470.15 when 800 items are produced. CD. The cost of producing the 801st item is about $2,151.68