An internet service provider in a town has 500 subscribers and charging ₹300 per month from each subscriber. He proposes to increase the monthly charges and it is believed from past experience that for every increase of ₹1, one subscriber will discontinue the service.

The maximum revenue generated per month is

₹160000

Max. Revenue R(100) = -(100)² + 200(100) + 150000

= - 10000 + 20000 + 150000 = 160000