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Question
The total revenue in rupees received from sale of x units of a product is given by $R(x) = 13x^2 + 26x + 15$
Find the marginal revenue when x = 7.
Solution
The correct answer is 208
Explanation
Marginal revenue = $\dfrac{dR}{dx}$ = $\dfrac{d}{dx} (13x^2 + 26x + 15)$
= $(26x + 26)$
When $x=7$, Marginal revenue = $26(7) + 26 = 208$
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