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MArginal profit help

  1. Sep 21, 2011 #1
    1. The problem statement, all variables and given/known data

    An electronics manufacturing company has determined that the cost of producing x units
    of its newest personal stereo is given by C = 4000 + 9.55x, and the monthly demand
    equation is given by px=20,000 - x/500. Find the marginal profit for a production level of
    3000 units per month.

    I know the answer is $18.45 but I can't figure out how to start. Would I take the deriv of C? Surely not...

    2. Relevant equations



    3. The attempt at a solution
    I know the answer is $18.45 but I can't figure out how to start. Would I take the deriv of C? Surely not...
     
  2. jcsd
  3. Sep 21, 2011 #2
    Edit: I misread the question.
     
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