Answer:
Since, marginal revenue is the rate of change of total revenue with respect to the number of items sold. \[\therefore \] Marginal revenue \[=\frac{dR}{dx}=\frac{d}{dx}(13{{x}^{2}}+26x+15)\] \[=26x+26=26(x+1)\] Now, when x = 7, then Marginal revenue \[=26(7+1)=26\times 8=208\] Hence, the required marginal revenue is Rs. 208.
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