The daily cost (in dollars) of producing Samsung VR headsets is given by C(2) = 400 4 20022 4 723 where a denotes the number of headsets produced in a day and the total revenue in dollars is given by R(x) = 3000x - 70x2 Using the marginal average profit function, P '(x), approximate the marginal average profit when 2 headsets have been produced and sold. O -198 O -158 O -148 O -218 -208