Question

Suppose each year 60 000 people move into Gauteng province, 85000 people move out, 32000 are born and 18000 die. Write a balance equation on the population in Gauteng province accumulated per year. (Let P denote people)

Answer 1

number of population in year 0 = P

population that move into = 60,000

population that move out = 85,000

population born = 32,000

population that die = 18,000

Net change in population = $60,000 - 85,000 + 32,000 - 18,000= -11,000$

Therefore the population equation is;

$P_n = P_{n-1} - 11,000$

(where n is the year)