The money to be spent for the welfare of the employees of a firm is proportional to the rate of change of its total revenue (Marginal Revenue). If the total revenue ( in rupees) received from the sale of x units of a product is given byR(x) = 3x2 + 36 x + 5, find the marginal revenue, when x = 5, and write which value does the question indicate.

The money to be spent for the welfare of the employees of a firm is proportional to the rate of change of its total revenue (Marginal Revenue). If the total revenue ( in rupees) received from the sale of x units of a product is given by

R(x) = 3 $x^{2}$ + 36 x + 5, find the marginal revenue, when x = 5, and write which value does the question indicate.

Match the items on the right to the items on the left.

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M(x) proportional to Money spent on the welfare of employees.

Thus, M(x) = k (Money spent on the welfare of employees)

M(x) = 6 x + 36

At x = 5, M(x) = 66

Now at x = 6, M(x) = 72

Thus Marginal Revenue for x = 5 is 66

And when x increased from x = 5 to x = 6, Marginal revenue also increases and thus the money spent on the welfare of employees increases.