Explanation

The increase in number of individuals in particular time period is termed as ‘birth rate’ or ‘natality’, while the individuals dying over a time period is known as ‘mortality’ or ‘death rate’. Birth rate = 100 Death rate = 10 Number of individuals in a population = 1000 Natural growth rate = 100 – 10 = 90 So, percentage of growth rate = $\frac{90}{1000} \times 100 = 9\%$.