Question

scientists use the rule of 70 to calculate human population growth. according to the rule of 70, what is the doubling time for a nation with a population growth rate of 5% per year? years

Explanation:

Step1: Recall the rule of 70 formula

The rule of 70 formula for doubling - time $T_d$ is $T_d=\frac{70}{r}$, where $r$ is the growth rate as a percentage.

Step2: Substitute the given growth rate

Given $r = 5\%$, substitute $r = 5$ into the formula $T_d=\frac{70}{r}$. So, $T_d=\frac{70}{5}$.

Step3: Calculate the result

$\frac{70}{5}=14$.

Answer:

14