Suppose a product's revenue function is given by $\displaystyle {R}{\left({q}\right)}=-{4}{q}^{{2}}+{800}{q}$ , where $\displaystyle {R}{\left({q}\right)}$ is in dollars and $\displaystyle {q}$ is units sold. Find the rate that revenue changes when $\displaystyle {108}$ units are sold.



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