Question

the population of a place is increased to 5400 in 2020 at a rate of 5% per annum find the population in 2018​

Answer 1

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Answer 2

Given:

We use formula of amount of compound interest to find population  

A( 2020)= 54,000,

R = 5%,  

n = 2 years

In 2018 Population would be less than 2020 in two years.

A(2020)= P(2018)(1+R/100)^n

54000 = P (2018)(1+5/100)²

54000 = P(2018)(1+1/20)²

54000= P(2018)(21/20)²

54000 = P(2018)((21×21)/(20×20))

P(2018)=( 54000×20×20)/21×21

Population in 2018 = 48979.59= 48980(approx)

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Answered by Arth.