Study the following extract on country Y's population data and answer the questions that follow. The population of country Y in 1970 was 60 million. From 1971 to 1975 the total number of births was 25 million and deaths stood at 3 million. 8 million immigrants and 4 million emigrants were recorded in the reporting period. (a) Present the above data in a table. (b) (i) Determine the net migration within the period. (ii) Calculate the population of the country in 1975. (c) What is the percentage increase in the population of the country from 1970 to 1975?
Explanation
(a) Country Y's Population data
year
No. of Death in Million
No. of Death in million
No. of 1mm. in million
No. of Emm. in million
Total population in million
1970
-
-
-
-
60
1971 - 75
25
3
8
4
86
OR
year
1970
1971 - 75
Number of births in millions
-
25
Number of deaths in millions
-
3
Number of immigrants in millions
-
8
Number of emigrants in millions
-
4
Total population in million
60
86
(b)(i) Net Migration = immigrants — Emigrants 8 million — 4 million = 4 million (ii) Total population in 1975 = 1970 population + Net Migrations + (number of births — number of deaths) 60 million + 4 million + (25 million — 3 million) or 64 million + 22 million. = 86 million. (c) Percentage increase New population — old population x 100 Old population 86 million - 60 million x 100 60 million 26 x 100 = 43.33% 60 = 8% for B
