Question

use an annual growth rate of 1.5% in a 20 year period for a certain population to find the approximate doubling time and then predict the population in 2050, based on a 2000 population of 3.0 billion.

what is the approximate doubling time?
years
(round to the nearest whole number as needed.)

Explanation:

Calculate the approximate doubling time using the Rule of 70

$$ T_{\text{double}} \approx \frac{70}{r} = \frac{70}{1.5} \approx 46.67 $$

Round to the nearest whole number

$$ T_{\text{double}} \approx 47 $$

Answer:

What is the approximate doubling time?
<blank>47</blank> years
(Round to the nearest whole number as needed.)