The total cost (in dollars) of producing x food processors is Cx) 2300 +80x -0.4x2 (A) Find the exact cost of producing the 81st food processor (B) Use the marginal cost to approximate the cost of producing the 81st food processor. A) The exact cost of producing the B1st fod processoris $ 156 (B) Using the marginal cost, the approximate cost of producing the 81st food processor is