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profit function = -0.000001x^3 +0.017 x^2 -470x -80000
Margin cost = 0.000003x^2-0.14x+590
Margin Profit = -0.000003x^2+0.034 x -470
c'(3000) = 197
R'(x) = -341
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Jul 9th, 2015
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