2) The total cost in dollars of producing x lawn mowers is given by C(x) = 4,000+ 90x- -. Find the x² marginal average cost at x = 20, C'(20) and interpret the result. A) -$1.33; a unit increase in production will decrease the average cost per unit by approximately $1.33 at a production level of 20 units. B) -$20.33; a unit increase in production will decrease the average cost per unit by approximately $20.33 at a production level of 20 units. C) -$10.33; a unit increase in production will decrease the average cost per unit by approximately $10.33 at a production level of 20 units. D) -$13.33; a unit increase in production will decrease the average cost per unit by approximately $13.33 at a production level of 20 units. deled by 2)