Question

Explain the rule of 70 and how it is used to estimate a population's doubling time. Solve the following example using the rule of 70: If a country has a population of 2,410,350, and a growth rate of 1.55%, what will be the doubling time of this population?

Answer 1

The rule of 70 is a formula used to estimate a population's doubling time by dividing 70 by the growth rate. To solve the example, we convert the growth rate to a decimal and divide 70 by it.

Step-by-step explanation:

The rule of 70 is a formula used to estimate a population's doubling time. It states that the doubling time can be found by dividing 70 by the percentage growth rate. For example, a 1% growth rate would result in a doubling time of 70 years, while a 2% growth rate would result in a doubling time of 35 years.

To solve the given example using the rule of 70, we first convert the growth rate to a decimal by dividing it by 100. So, 1.55% becomes 0.0155. Then, we divide 70 by 0.0155 to find the doubling time. The result is approximately 4,516 years.