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Home » Three years before the population of a village was 10000. If at the end of each year, 20% of the people migrated to a nearby town, what is its present population?
Three years before the population of a village was 10000. If at the end of each year, 20% of the people migrated to a nearby town, what is its present population?
CBSE | Class 11 | Excercise 12D | Geometrical Progression | Maths
Three years before the population of a village was 10000. If at the end of each year, 20% of the people migrated to a nearby town, what is its present population?

Answer : To find: Present population of the village Given: (i) Three years back population – 10000

  • Time – 3 years
  • Rate – 20% per annum

Number of people migrated on the very first year is 20% of 10000

People left after migration in the very first year = 10000 – 2000

= 8000

Number of people migrated in the second year is 20% of 8000

People left after migration in the second year = 8000 – 1600

= 6400

Number of people migrated in the third year is 20% of 6400

People left after migration in the third year = 6400 – 1280

= 5120

Ans) The present population is 5120

 

i

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