JAMB Economics 1981 Question 3

If P₈ and P₉ represent the population of West Africa in 1978 and 1979 respectively, and given that in 1979
D = number of deaths
B = number of births
I = number of immigrants
E = number of emigrants.
Then the size of the population in 1979 is given by

1. A.P₉ = P₈ + D − B + I − E
2. B.P₉ = P₈ + B − D + I − E
3. C.P₉ = P₈ + B − D + E − I
4. D.P₉ = B − D + I − E
5. E.P₉ = P₈ + B + D + I + E.