Consider the following data: | Year | Birth Rate | Death Rate | |-------------|------------|------------| | 1911-1921 | $48.1$ | $35.5$ | | 1921-1931 | $46.4$ | $36.3$ | | 1931-1941 | $45.2$ | $31.2$ | | 1941-1951 | $39.9$ | $27.4$ | | 1951-1961 | $41.7$ | $22.8$ | | 1961-1971 | $41.1$ | $18.9$ | | 1971-1981 | $37.1$ | $14.8$ | For which period was the natural growth rate maximum?

Question

CSATMediumPrelims 2020Maths

Consider the following data:

Year	Birth Rate	Death Rate
1911-1921	$48.1$	$35.5$
1921-1931	$46.4$	$36.3$
1931-1941	$45.2$	$31.2$
1941-1951	$39.9$	$27.4$
1951-1961	$41.7$	$22.8$
1961-1971	$41.1$	$18.9$
1971-1981	$37.1$	$14.8$

For which period was the natural growth rate maximum?

Explanation

We know that the Natural Growth Rate is calculated as: Natural Growth Rate= $Birth Rate - Death Rate$ Now, considering the given years:

Natural growth rate in the period 1911-1921 = $48.1 - 35.5 = 12.6$ Natural growth rate in the period 1941-1951 = $39.9 - 27.4 = 12.5$ Natural growth rate in the period 1961-1971 = $41.1 - 18.9 = 22.2$ Natural growth rate in the period 1971-1981 = $37.1 - 14.8 = 22.3$ Hence, we can conclude that the natural growth rate was the maximum in the period 1971-1981.