The population of a country increases at a rate proportional to the number of inhabitants. `f` is the population which doubles in 30 years, then the population will triple in approximately. (a) 30 years (b) 45 years (c) 48 years (d) 54 years

A population grows at the rate of 5% per year. Then the population will be doubled in :

The population of a certain is known to increase at a rate proportional to the number of people presently living in the country. If after two years the population has doubled, and after three years the population is 20,000 estimates the number of people initially living in the country.

The population of a town increases at the rate of 40 per thousand annually. If the present population be 175760, what was the population three years ago.

The population of a town is increasing at the rate of 5% per annum. What will be the population of the town on this basis after two years, if the present population is 16000?

The population of town increases by 10% annually. If the present population is 22000, find the its population a year ago.

The population of a town increases at the rate of 50 per thousand. Its population after 2 years will be 22050. Find its present population.

The population of a town increases by 6% every year. If the present population is 15900, find its population a year ago.

The population of a city increased by 10% in the previous year. If the present population is 1,32,000, what was the population of the city a year ago?

The population of a city increases each year by 4% of what it had been at the beginning of each year. If the population in 1999 had been 6760000, find the population of the city in (i) 2001 (ii) 1997.