The total revenue in Rupees received from the sale of x units of a product is given by

R(x) = 13x2 + 26x + 15.


Find the marginal revenue when x = 7.

Marginal revenue (MR) is the rate of change of total revenue with respect to the number of units sold.

Then,


So, when x = 7 then,


MR = 26(7) + 26 = 208


Therefore, the marginal revenue when x = 7 is Rs. 208.


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