Fewpal
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The population of a town increases by 10% annually. If the present population is 22000, find its population a year ago.

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Given details are,

Present population of town is = 22000

Let the population of town be 100 a year ago.

Then,

Annual population increase is = 10% of 100 = 10

The present population = 100 + 10 = 110

If present population is 110, population year ago = 100

If present population is 1, population year ago = 100/110

If present population is 22000, population year ago = 100/110 × 22000

= 10/11 × 22000

= 20000

∴ 1 year ago population was 20000

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