The revenue R in dollars received from selling x radios is R(x) = x(90 - x). (a)

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The revenue R in dollars received from selling x radios is R(x) = x(90 - x). 

(a) Evaluate R (20) and interpret the result. 

(b) What number of radios sold maximize revenue? 

(c) What is the maximum revenue? 

(d) What number of radios should be sold for rev- enue to be $2000 or more?

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