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Difficulty: MediumPopulation Concepts and Growth Dynamics

The table below presents crude birth rates (CBR) and crude death rates (CDR) per 1,0001,000 population for four administrative divisions in a West African country:

DivisionCrude Birth Rate (CBR)Crude Death Rate (CDR)
Division W45451818
Division X383888
Division Y282866
Division Z15151111

Based on the data provided, which division exhibits the highest annual Rate of Natural Increase (RNI)?

  1. Division XAnswer
  2. B
    Division W
  3. C
    Division Y
  4. D
    Division Z

Answer

Division X exhibits the highest annual Rate of Natural Increase (RNI) at 3.0%3.0\% (3030 per 1,0001,000).
Division X has the highest Rate of Natural Increase because subtracting its crude death rate of 8 per 1,000 from its crude birth rate of 38 per 1,000 yields a net natural increase of 30 per 1,000 (or 3.0% annually), which exceeds all other divisions.

Step-by-Step Solution

1
Recall the formula for Rate of Natural Increase (RNI)
RNI=Crude Birth Rate (CBR)−Crude Death Rate (CDR)\text{RNI} = \text{Crude Birth Rate (CBR)} - \text{Crude Death Rate (CDR)}
Natural population growth excludes net migration and is determined solely by the difference between birth rates and death rates.
2
Calculate the RNI per 1,0001,000 for each division
Division W: 45−18=2745 - 18 = 27 per 1,0001,000 (2.7%2.7\%)
Division X: 38−8=3038 - 8 = 30 per 1,0001,000 (3.0%3.0\%)
Division Y: 28−6=2228 - 6 = 22 per 1,0001,000 (2.2%2.2\%)
Division Z: 15−11=415 - 11 = 4 per 1,0001,000 (0.4%0.4\%)
Evaluating each division systematically allows direct comparison.
3
Identify the division with the maximum RNI value
Division X has the maximum RNI of 3030 per 1,0001,000 (3.0%3.0\%).
Comparing 3030 per 1,0001,000 against 2727, 2222, and 44 confirms Division X is the highest.

Key Concept

Rate of Natural Increase (RNI)
Estimated Time:1m 15s
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Topics

Population Concepts and Growth Dynamics

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