# Use the exponential growth model #P(t) = P_0e^(kt)#. How long will it take for the population of a certain country to double if its annual growth rate is 3.5%?

##### 1 Answer

Aug 1, 2016

20.15 years to 2 dp

#### Explanation:

Let's assume the units of t are years. We want to find k.

Now need