Question

use an annual growth rate of 0.6% in a 30 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:

Identify the given growth rate

$$ r = 0.6\% $$

Apply the Rule of 70 for approximate doubling time

$$ T_{\text{double}} \approx \frac{70}{r} = \frac{70}{0.6} $$

Calculate and round to the nearest whole number

$$ T_{\text{double}} \approx 116.67 \approx 117 \text{ years} $$

Answer:

What is the approximate doubling time?
<blank>117</blank> years
(Round to the nearest whole number as needed.)