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The total cost C (x) in Rupees associated with the production of x units of an item is given by `C (x)= 0.007 x^3- 0.003 x^2 +15x+ 4000`. Find the marginal cost when 17 units are produced.

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`C(x) = 0.007x^(3) - 0.003x^(2)+ 15x+ 4000`
Marginal cost ` = (dC)/(dx) = 0.021x^(2) - 0.006x+15`
at x = 17, the marginal cost
` = 0.021 (17)^(2) - 0.006(17) + 15`
` = 6.069- 0.102 +15`
` = Rs. 20.967`
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