Question

Present population of a town is 10,240. It decreases by 20% annually. Find its population before 3 years?

Answer 1

Answer:

the answer is 140%

thank you

hope so it will be helpful

please mark me as brainlest

Answer 2

Given :

Population of the town = 10240

Decreasing percentage = 20% annually

To find :

Population of the town before 3 years .

Solution :

Let the initial population be X .

then , population after n years = X *  $[ 1 - (20/100) ]^{n}$

then , according to the question ,

  10240 = X * (4/5) * (4/5) * (4/5)

→ X = ( 10240 * 5 * 5 * 5 ) / ( 4 * 4 * 4 )

→ X = 20000

The population of the town before 3 years was 20000