In a given administrative zone in West Africa with an estimated mid-year population of 250… — JAMB UTME

In a given administrative zone in West Africa with an estimated mid-year population of $250{}000$ , a demographic survey recorded $7{}500$ live births and $2{}500$ deaths during a single calendar year. In the same year, records showed that $1{}250$ individuals moved permanently into the zone while $750$ individuals emigrated out. Based on these demographic statistics, what is the annual total population growth rate of the zone expressed as a percentage?

Answer: 2.2 %

Answer

The annual total population growth rate of the administrative zone is

2.2\%

The total population growth rate integrates natural growth (live births minus deaths) and net migration balance (immigrants minus emigrants). With

5{}000

net natural additions (

2.0\%

) and

500

net migration additions (

0.2\%

), the total annual growth rate equals

2.2\%

Step-by-Step Solution

Determine the natural population change

Natural Increase = Births - Deaths =

7{}500 - 2{}500 = 5{}000

Natural population change isolates natural demographic events prior to factoring in net spatial mobility.

Calculate the Rate of Natural Increase (RNI) as a percentage

\text{RNI} = \left(\frac{5{}000}{250{}000}\right) \times 100\% = 2.0\%

Expressing natural increase relative to the mid-year population standardized as a percentage yields the natural growth rate.

Determine the net migration change and Net Migration Rate (NMR)

Net Migration = Immigrants - Emigrants =

1{}250 - 750 = 500

;

\text{NMR} = \left(\frac{500}{250{}000}\right) \times 100\% = 0.2\%

Net migration accounts for population gains and losses resulting from external spatial movements.

Sum the Rate of Natural Increase and Net Migration Rate

\text{Total Population Growth Rate} = 2.0\% + 0.2\% = 2.2\%

Overall population growth rate is the sum of natural population growth rate and net migration rate.

Key Concept

Calculation of Total Population Growth Rate incorporating Natural Increase and Net Migration

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