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14. Compound Interest
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Q7 of 89 Page 14

The annual rate of growth in population of a certain city is 8%. If its present population is 196830, what it was 3 years ago?

Given,


Annual growth rate of population of city = 8%


Present population of city = 196830


Let population of city 3 years ago was = X


So,


=


=


=


Hence,


Population of city 3 years ago was = 156250.


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There is a continuous growth in population of a village at the rate of 5% per annum. If its present population is 9261, what it was 3 years ago?

6

In a factory the production of scooters rose to 46305 from 40000 in 3 years. Find the annual rate of growth of the production of scooters.

8

The population of a town increases at the rate of 50 per thousand. Its population after 2 years will be 22050. Find its present population.

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14. Compound Interest
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