If a population has a growth rate of 2.5 percent how long will it take to double?

To calculate the doubling time of a population with a growth rate of 2.5 percent, you can use the Rule of 70. The Rule of 70 states that you divide 70 by the growth rate to determine the doubling time. In this case, 70 divided by 2.5 equals 28. Therefore, it would take approximately 28 years for the population to double with a growth rate of 2.5 percent.