The total cost (in dollars) of producing x food processors is C(x)=1600+80x0.3x2. (A) Find the exact cost of producing the 81 st food processor. (B) Use the marginal cost to approximate the cost of producing the 81 st food processor. (A) The exact cost of producing the 81st food processor is $ (B) Using the marginal cost, the approximate cost of producing the 81 st food processor is $ Find the marginal revenue function. R(x)=x(290.06x) R(x)= Find f(x) f(x)=3x214xx38 f(x)=