Increasing and Decreasing and Local Extrema for a Revenue Function

An office supply company sells external web cameras. The price-demand function for the web cameras is \(p(x)=-0.2x+56\), where \(p(x)\) is the price, in dollars, per camera when \(x\) web cameras are purchased. Find the intervals where the company's revenue function, \(R\), is increasing/decreasing as well as the local extrema of the revenue function, assuming \(R(x)\) is the company's revenue, in dollars, when \(x\) web cameras are sold.

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