posted by Anonymous .
The population of the world in 1987 was 5 billion and the annual growth rate was
estimated at 2 percent per year. Assuming that the world population follows an
exponential growth model, find the projected world population in 2015.
Population in billions at time t (counting from 1987) as
where A and k are constants.
At t=0 (1987),
the formula becomes:
Take log both sides
k=log(1.02) [natural log]
where log(1.02)=0.0198 approx.