Question

The annual rate of growth of population of a town is 12%. If its present population is 186040, what was the population two years ago.

Answer 1

Since the annual rate of population is 12%, which means the population of the town increases by 12% every year.
Then after 2 years population will increase 2 x 12 %=24%.
So after 2 years population will increase by 24%.
Now 24 % of 186040 = (24 × 186040)/100 = 44649.6.
so the total population is equals to
= 186040 + 44649.6 = 230689.6
which is the proximity equals to 230690, around 2 Lacs 30 thousands 6 hundred and 90.
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Answer 2

the answer will be 148310