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The management of a watch company has determined that the daily marginal revenue function associated with producing and selling their travel clocks is given by
R’(x)= -0.009x + 12
where x denotes the number of units produced and sold and R’(x) is measured in dollars/unit. Determine the revenue function R(x) associated with producing and selling these clocks.

Some help with this problem is greatly appreciated.

Integral of the equation is

R(x) = -0.0045x^2 + 12x