Question

the population of a town increases 10% annually if the present population of a town is 22000 find its population one year ago

Answer 1

Answer :-

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Given :-


• The population of a town increases 10% annually.

• The present population of a town is 22000.


To find :-


• The population one year ago.


Salutation :-


Let the population one year ago was p

Time ( n ) = 1 year

Rate of increase per year ( r% ) = 10 %

Now according to the question ,

p ( 1 + r / 100 )ⁿ = 22000

p × ( 1 + 10 / 100 )¹ = 22000

p × 11 / 10 = 22000

p = 22000 × 10 / 11

p = 2000 × 10

p = 20000

•°• The population one year ago was 20,000

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Note :-

Used identity → Compounded amount = p ( 1 + r / 100 )ⁿ

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