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A region's population declines from 5 million to 4.75 million. What is the percentage decrease?

Answer and explanation

Correct answer: 5 percent

Percentage decrease measures the fall relative to the original population, not relative to the final population. The original population is 5 million and the final population is 4.75 million. First find the numerical decrease: 5 − 4.75 = 0.25 million, which is 250,000 people. This decrease must then be compared with the original 5 million.

Percentage decrease = (0.25 ÷ 5) × 100 = 5 percent. Therefore, option B is correct. The same calculation in lakhs is (2.5 lakh ÷ 50 lakh) × 100 = 5 percent. The value 2.5 is the absolute decrease in lakh, not the percentage decrease. Using the final population as the denominator would answer a different question and would not give the standard percentage decline.

Related tags

Percentage DeclinePopulation DecreasePopulation CalculationNegative GrowthPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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