In a culture the bacteria count is 100000. The number is increased by 10% in 2 hours. In how many hours will the count reach 200000, if the rate of growth of bacteria is proportional to the number present.

In a culture,the bacteria count is 1,00,000. The number is increased by 10% in 2 hours.In how many hours will the count reach 2,00,000, if the rate of growth of bacteria is proportional to the number present?

The population of city doubles in 80 years , in how many year will it be triple when the rate of increase is proportional to the number of inhabitants.

A number is increased by 10%. To obtain the old number, by how much percent should it be decreased?

If the population of country double in 50 years, in how many years will it triple under the assumption that the rate of increase is proportional to the number of inhabitants.

The rate of increase in the number of bacteria in a certain bacteria culture is proportional to the number present. Given the number triples in 5 hrs., find how many bacteria will be present after 10 hours. Also find the time necessary for the number of bacteria to be 10 times the number of initial present. [Given log_e3=1. 0986 , e^(2. 1972)=9 ]

The number of trees in a town is 17640. If the number of trees increases annually at the rate of 5%, how many tress were there 2 years ago ?

In a certain experiment the count of bacteria was increasing at the rate of 2.5% per hour. Initially, the count was 512000. Find the bacteria at the end of 2 hours.

An initial number of bacteria presented in a culture is 10000. This number doubles every 30 minutes. How long will it take to bacteria to reach the number 100000 ?