# Answer to Question #19173 in Calculus for Dhaval Patel

Question #19173

The manager of a large apartment complex knows from experience that 80 units will be occupied if the rent is 324 dollars per month. A market survey suggests that, on the av- erage, one additional unit will remain vacant for each 6 dollar increase in rent. Similarly, one additional unit will be occupied for each 6 dollar decrease in rent. What rent should the manager charge to maximize revenue?

Expert's answer

The revenue is :R= number of units*rent per month.

Let x is the number of additional units, then

R(x)=(80-x)(324+6x)=25920+156x-6x^2.

The revenue maximize when the derivation of R(x)=0.

(dR/dx)=156-12x=0

x=13

The rent is 324+13*6=402 dollars

Let x is the number of additional units, then

R(x)=(80-x)(324+6x)=25920+156x-6x^2.

The revenue maximize when the derivation of R(x)=0.

(dR/dx)=156-12x=0

x=13

The rent is 324+13*6=402 dollars

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