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 village increases continuously at the rate proportional to the number of its inhabitants present at any time. If the population of the village was 20, 000 in 1999 and 25000 in the year 2004, what will be the population of the village in 2009?

The population of a city was 20,000 in the year 1997. It increased at the rate of 5% p.a. Find the population at the end of the year 2000.

The rate of increase of bacterial in a certain culture is proportional to the number of bacterial present. If it is found that the number doubled in 5 hours, prove that the bacterial becomes eight times at the end of 15 hours.

What would be the percent growth or birth rate per individual per hour for the same population mentioned in the population after some years?

In 2005, for each of the 14 million people present in a country, 0.028 were born and 0.008 died during the year. Using exponential equation, the number of people present in 2015 is predicted as:

The population control unit wants to find : “How many people will be in a certain country after 10 years.”

Find population of a city after 2 years,which is at present 12 lakh,if the rate of increase is 4%.

If a population of 50 Paramecium present in a pool increases to 150 after an hour, what would be the growth rate of population?

A certain radioactive material is known to decay at a rate proportional to the amount present. Initially there is 50 kg of the material present and after 2h it is observed that the material has lost 10% of its original mass. Based on these data answer the following questions. The time at which the material has decayed to one half of its initial mass is