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If a country's population is 9 million and declines by 5 percent, what will the new population be?

Answer and explanation

Correct answer: 8.55 million

Correct answer: B, 8.55 million, or 85.5 lakh. First convert the percentage to a decimal: 5 percent equals 0.05. The decrease is 9,000,000 × 0.05 = 450,000. Subtract this decrease from the original population: 9,000,000 − 450,000 = 8,550,000, which is 8.55 million or 85.5 lakh. A is wrong because it subtracts too much, giving 8.25 million. C is wrong because it subtracts only 0.3 million, not 5 percent of 9 million. D is wrong because 9.45 million is obtained by adding 5 percent, so it represents a 5 percent increase rather than a decline. The safe method is: final population = original population × (1 − rate). Here, 9 × 0.95 = 8.55 million.

Related tags

Percentage DecreasePopulation CalculationPopulation DeclineNegative GrowthPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And GrowthGeography

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