The total cost $C(x)$ in Rupees associated with the production of $x$ units of an item is given by $C(x) = 0.007x^{3} - 0.003x^{2} + 15x + 4000$. Find the marginal cost when $17$ units are produced.
- A$Rs. 20.967$
- B$Rs. 21.500$
- C$Rs. 19.850$
- D$Rs. 22.100$
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