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

The growth of a population is proportional to the number present. If the population of a colony doubles in 50 years, in how many years will the population become triple?

The population P in any year t is such that the rate of increase in the population is proportional to the population. Then

The population of a village increases continuously at the rate proportional to the number of its Inhabitants present at any time. It the population of the village was 20,000 in 1999 and 25,000 in the year 2004, what will be the population of the village in 2009 ?

The population of a country increases by 2% every year. If it increases k times in a century, then prove that [k]=7,w h e r e[dot] represents the greatest integer function.