The Marginal Benefit of hiring workers for a firm is given by: MB 2.000 - 2L. = The Marginal Cost to the firm of hiring workers is given by: MC 1,400+ L. L represents the number of workers.. a) Calculate the optimal amount of workers that the organization should hire. b) Draw a well labelled diagram of the solution. c) Explain briefly the slopes of the Marginal Benefit and Marginal Cost Curves. Why does it cost more to hire each additional worker? Why does the benefit of each additional worker decrease?