The annual rate of growth in population of a certain city is 8%. If it

1.	The annual rate of growth in population of a certain city is 8%. If its present population is 196830, what it was 3 years ago?
Answer» Given details are, Annual growth rate of population of city is = 8% Present population of city is = 196830 Let population of city 3 years ago be = x By using the formula, A = P (1 + R/100) 196830 = x (1 + 8/100) (1 + 8/100) (1 + 8/100) 196830 = x (27/25) (27/25) (27/25) 196830 = x (1.08) (1.08) (1.08) 196830 = 1.259712x x = 196830/1.259712 = 156250 ∴ Population 3 years ago was 156250.

The annual rate of growth in population of a certain city is 8%. If its present population is 196830, what it was 3 years ago?

Answer»

Given details are,

Annual growth rate of population of city is = 8%

Present population of city is = 196830

Let population of city 3 years ago be = x

By using the formula,

A = P (1 + R/100)

196830 = x (1 + 8/100) (1 + 8/100) (1 + 8/100)

196830 = x (27/25) (27/25) (27/25)

196830 = x (1.08) (1.08) (1.08)

196830 = 1.259712x

x = 196830/1.259712

= 156250

∴ Population 3 years ago was 156250.