Question

The population of a town increase at the rate 20% per annum. If the population of the town is 216000, then find its population 2 years ago.

Answer 1

hello ☺

If population increases by 20% each year

let the present population is P(0) = 216000.

P(1) = Population after 1 year = P(0) X (100+20)/(100) = 1.2 X P(0)


Now, P(2) = 1.2 X 1.2 X P(0) = 311040.

Population after 2 years.

P(-1) = Population 1 year ago = P / 1.2

P(-2) = P/(1.2 X 1.2) = 150000. Population 2 years ago.


thank you

Answer 2

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