How to find population `n` years ago?

The present population of a city is 9261000. If it had been increasing at the rate of 5% per annum, find its population 3 years ago.

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

The annual rate of growth in population of a certain city is 8% .population is 1,96,830, what was the population three years ago?

The population of a town increases at the rate of 15% per annum. If the present population is 108445 of town, then what was the population 2 years ago?

The population of a town increases at the rate of 10% per annum. If the present population of the town is 266200, then what was the population 3 years ago?

The population of a town was decreasing every year due to migration, poverty and unemployment. The present population of the town is 6,31,680. Last year the migration was 4% and the year before last, it was 6%. What was the population two years ago?