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If previous population is twenty five lakh and current population is thirty lakh, what is the growth rate?

Answer and explanation

Correct answer: Twenty percent

The direct answer is B: twenty percent. Growth rate is found by comparing the increase with the previous population, not with the current population. First find the absolute increase: current population − previous population = 30 lakh − 25 lakh = 5 lakh. Next divide this increase by the previous population: 5 ÷ 25 = 0.2. Finally multiply by 100 to convert it into a percentage: 0.2 × 100 = 20%. Therefore, the growth rate is 20%. Option A is incorrect because 5 is not 10% of 25. Option B is correct because 5 is one-fifth of 25, and one-fifth equals 20%. Option C would mean an increase of 6.25 lakh over 25 lakh, which is not the case. Option D would mean an increase of 7.5 lakh. Memory cue: percentage growth = increase ÷ original population × 100.

Related tags

Population GrowthGrowth RatePercentage CalculationPopulationGeographyClass 9 Mcq

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