Question

Consider the following data:

Year	Birth rate	Death rate
1911-1921	48.1	35.5
1921-1931	16.4	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? 

1. 1911-1921
2. 1941-1951
3. 1961-1971
4. 1971-1981

Answer 1

Correct Answer - Option 4 : 1971-1981

Formula used :

Natural growth rate = Birth rate - death rate 

Calculations :

Natural growth rate for all years 

For year 1911-1921 = 48.1 - 35.5 = 12.6

For year 1921-1931 = 16.4 - 36.3 = -19.9

For year 1931-1941 = 45.2 - 31.2 = 14

For year 1941-1951 = 39.9 - 27.4 = 12.5

For year 1951-1961 = 41.7 - 22.8 = 18.9

For year 1961-1971 = 41.1 - 18.9 = 22.2

For year 1971-1981 = 37.1 - 14.8 = 22.3 

Here we can see that maximum difference is in the year 1971-1981 

∴ The answer will be the option 4