The population of a village decreases each year by 20%. If the present population of the village is 8,000 then find the population of village two years ago.

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  1. 15,000
  2. 10,000
  3. 12,500
  4. 11,500

Answer (Detailed Solution Below)

Option 3 : 12,500
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Given :

The population of a village decreases each year by 20%.

And the present population of the village is 8,000

Formula used :

Old population × (decreased percent /100) time = present population

Calculation :

Let the population of village two years ago be x

According to the question,

⇒ x × 80/100 × 80/100 = 8,000

⇒ x = 8000 × 25/16

⇒ x = 12500

∴  x = 12,500
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