Thread: decay

17. The population of Springield was 3500 in 1940. Assuming the population is increasing at a rate of 3.2%, what will the population be in 2005?

Originally Posted by rlarach

17. The population of Springield was 3500 in 1940. Assuming the population is increasing at a rate of 3.2%, what will the population be in 2005?

Standard formula:

where is the % population growth rate divided by 100 and is the initial population.

For your question, (taking 1940 to be t = 0) and k = 3.2/100 = 0.032. Therefore P = .......

Now sub t = 65 and solve for P.