Question

In a city the population of female increase from 100000 to 133100 in three years find the annual rate of growth

Answer 1

Answer:

The present population of a city is 3,02,500. If the population increases by 10% every year, what was the population of the city two years ago?

A

2,80,000

B

2,75,000

C

2,48,000

D

2,50,000

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ANSWER

Let the population before two years ago be x

Given the population increases by 10%

So increase in population after one year is 10010×x=0.1x

So population after one year is x+0.1x=1.1x

Increase in population after another one year is 10010×1.1x=0.11x

So population at present is 1.1x+0.11x=1.21x

But given population at present is 3,02,500

⟹1.21x=302500

⟹x=1.21302500=2,50,000

Population of city two years ago is 2,50,000