Question

the present population of a city is 250000.The rate of increase of population is 6% p.a.what will be the population of the city after 2 years solve step by step ​

Answer 1

Solution:

Given details are,

Present population is 25000 First year growth RI = 4% Second year growth R2 5%

Third year growth R; = 8%

Number of years = 3 By using the formula,

A = P (1 + R/100)"

RD Sharma Solutions for Class 8 Maths Chapter 14 - Compound Interest

So, population after three years = P(1 + R1/100) (1 + R/100) (1 + R3/100)

= 25000(1 + 4/100) (1 + 5/100) (1 + 8/100) = 25000 (1.04) (1.05) (1.08)

= 29484

Population after 3 years will be 29484

Answer 2

Given,

Population of a town = 1,25,000

Increase rate (per annum ) = 2%

2% of 1,25,000= 2/100×1,25,000

= 2,500 per annum.

after 3 years, the population growth will be= 2,500×3

=7,500

Population after 3 years = 1,25,000 + 7,500

= 1,32,500