Question

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 cxponential growth model, find the projected world population in 2015. Uses significant digits our final answer

Answer 1

The poupation in the year 2015 can be calculated as,

`P_(2015)=P_(1987)(n+r)^(2015-1987)`

Here,

`\begin{gathered} P_(1987)=5\text{ billion} \\ n=1\text{ (per year)} \\ r=2(\text{rate)} \end{gathered}`

Therefore,

`P_(2015)=5*(1+2)^(28)=1.14*10^(14)\text{ billion}`