The total revenue in Rupees received from the sale of $x$ units of a product is given by $R(x) = 3x^2 + 36x + 5$. Find the marginal revenue when $x = 5$,where marginal revenue is defined as the rate of change of total revenue with respect to the number of items sold at an instant.
- A$Rs. 66$
- B$Rs. 56$
- C$Rs. 76$
- D$Rs. 46$
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