The total revenue in Rupees received from the sale of x units of a product is given by R(x) = 3x ² + 36x + 5.

116

96

90

126

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Solution

126

straight R left parenthesis straight x right parenthesis space equals space 3 straight x squared plus 36 straight x plus 5 space space space space space space space space space space rightwards double arrow space space space straight R space equals space 3 straight x squared plus 36 straight x plus 5

Marginal revenue

equals space dR over dx space space equals space 6 straight x plus 36

When x = 15, marginal revenue = 6(15) + 36 = 90 + 36 = 126

therefore space space space left parenthesis straight D right parenthesis space is space correct space answer.

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