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A region's final population is 1.1 million, which is 10 percent higher than its initial population. What was the initial population?

Answer and explanation

Correct answer: 1 million

The final population is 10 percent greater than the initial population, so it represents 110 percent of the initial value. If the initial population is P, then the final population is \(1.10P\). Given a final population of 1.1 million, solve \(1.10P=1.1\) million. This gives \(P=1.1/1.10=1.0\) million, or 10 lakh. Therefore option A is correct.

It is important not to treat the final figure as the initial figure. The 10 percent increase is calculated from the initial population, not from the final population. A check confirms the answer: 10 percent of 1 million is 0.1 million, and adding it gives 1.1 million. Thus 9 lakh, 11 lakh, and 12.1 lakh do not satisfy the stated relationship.

Related tags

Initial PopulationReverse PercentagePopulation Growth CalculationBase PopulationPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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