The total cost $C(x)$ in Rupees,associated with the production of $x$ units of an item is given by $C(x) = 0.05x^3 - 0.2x^2 + 3x + 500$. The marginal cost,where $x = 3$ is $\rule{1cm}{0.15mm}$ (in Rupees).
- A$3.15$
- B$30.15$
- C$3.015$
- D$30.015$
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