# 16) The total revenue in Rupees received from the sale of x units of a product is given by $R ( x) = 13 x^2 + 26 x + 15$Find the marginal revenue when x = 7

Marginal revenue =  $\frac{dR}{dx}$
$R ( x) = 13 x^2 + 26 x + 15$
$\frac{dR}{dx} = \frac{d(13x^{2}+26x+15)}{dx} = 13\times2x+ 26 = 26(x+1)$
at x = 7
$\frac{dR}{dx} = 26(7+1) = 26\times8 = 208$
Hence, marginal revenue when x = 7 is 208

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