Final answer:
The rate of natural increase is calculated by subtracting the death rate from the birth rate, typically expressed as a percentage. Immigration and emigration are not included because this rate only measures growth due to births and deaths within the country.
Step-by-step explanation:
Calculating the Rate of Natural Increase
To calculate the rate of natural increase, you subtract the death rate from the birth rate within a country. This calculation is typically expressed as a percentage.
For example, if a country has a birth rate of 35 per 1,000 people and a death rate of 15 per 1,000 people, the rate of natural increase could be calculated as follows:
- Subtract the death rate from the birth rate: 35 - 15 = 20.
- Divide this number by the total population (per 1,000 in this case).
- Then, multiply by 100 to get a percentage: (20/1,000) x 100 = 2%.
Immigration and emigration are not included in this calculation because the rate of natural increase specifically measures population growth due to births and deaths within the country, rather than population changes due to people moving in and out.