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The total revenue Rs. R received form th...

The total revenue Rs. R received form the sale of x units of a product is given by `R(x) = 3x^2 + 36x + 5`. The marginal revenue when x = 5 is (marginal revenue is the rate of change of total revenue w.r.t. number of items sold at an instant)

A

66

B

Rs. 66

C

69

D

none of these

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