Question

the population of a town is 57600 .It decrease s every year at the rate of 4%per annum due to people migrating to other cities .what was the population 2years ago​

Answer 1

Answer:

Population 2 yeärs back was 62500

Explanation:

Let the population 2 yeärs back be x.

Given:

» Rate of decreasing per year = 4%

» Final value is given as 57600.

» and we will put x as the initial value. As, we always put final value several years back.

Now,

As we know the formula to calculate this type of question we use - initial value (1-R/100)ⁿ

⇒ final value = initial value(1-R/100)ⁿ

⇒ 57600 = x(1-4/100)²

⇒ 57600 = x(96/100)²

⇒ x = 57600 × 100 × 100/(96)²

⇒ 62500

Answer 2

Answer:

Just apply the formula of Compound Interest(CI)

you will get 62500