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Find the marginal cost and the marginal revenue when x = 10 , the total cost C(x) and the total revenue R (x) in Rupees, associated with production and sale of x units of an item are given by
`C (x) = 0.003 x^3 + 0.02 x^2 + 20 x + 1200
R (x) = 0.1 x^2 + 25 x - 100`.

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