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If an area's previous population is eighty lakh and increase is sixteen lakh, what will be the growth rate?

Answer and explanation

Correct answer: Twenty percent

Correct answer: A, twenty percent. Growth rate compares the increase with the previous population, which is the base. The increase is 16 lakh and the previous population is 80 lakh. Apply the formula: growth rate = (increase ÷ previous population) × 100 = (16 ÷ 80) × 100 = 20%. Because both figures are measured in lakh, the unit cancels and no conversion is needed. Option B is wrong because 16 lakh is the absolute increase, not the percentage. Option C reverses the relationship or treats the base as the smaller number; 16 is not 80% of 80. Option D is wrong because 8 lakh, not 16 lakh, would be 10% of 80 lakh. Always use the old population in the denominator. Memory cue: amount added over original amount, multiplied by 100.

Related tags

Growth RateAbsolute IncreasePercentagePopulation GrowthPopulationGeographyClass 9 Mcq

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