Answer to Question #3656 in Calculus for joe
R =(100-2n)(400+10n) → max
R' =(40000+200n-20n2 )' = 200 - 40n
R' =0 => n=5
R'' = -40 => n=5 - point of maximum
So, max revenue is $40,500 with the price $450/month.
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