- #1

Alain12345

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The landlord of a 40-unit apartment building is planning to increase the rent. Currently residents pay $700/month. Four units are vacant. A real estate agency has found that, in this market, every $25 increase in monthly rent results in one more vacant unit. What rent should the landlord charge to maximize revenue?

I know I have to come up with something and get the derivative of that then find the critical number, but if I can't get the first part, I can't continue to solve the problem...

Thanks