The birth rate in a certain city is 3.5% per year, and the death rate is 2% per year. Also, there is a net movement of population out of the city at a steady rate of 300 people per year. The population in 2016 was 5 million.
(a) Give the difference equation for yn, the population after n years.
(b) Estimate the 2021 population.
(c) When will the population exceed 6 million?
(d) When will the population have doubled to 10 million?