Find the population of a city at any time t,given that the rate of increase of population is proportional to the population at that instant and that in a period of 40 years the population increased 30,000 to 40,000.

The population of a city increases at the rate 3% per year. If at time t the population of city is p, then find equation of p in time t.

The rate of growth of the population of a city at any time t is proportional to the size of the population. For a certain city it is found that the constant of proportionality is 0.04. Find the population of the city after 25 years if the initial population is 10,000. [take, e =2.7182] .

The population of a town increases at a rate proportional to the population at that time . If the population increases from 40 thousands to 60 thousands in 40 years, What will be the population in another 20 years ? = [ Given: sqrt(3/2) = 1.2247 ]

Increase in population per unit time is called_____