Question

The population of town is 352800. If it increases annually at 5%, what will be its population 2 years hence. What was it 2 years ago?

Answer 1

Solution

Population after 2 years = 352800* (1+ 5/100)^2
= 352800 * 21/20 * 21/20 = 388962

Population 2 years ago = 352800 / (1+ 5/100)^2
= 352800 * 20/21 * 20/21 
= 320000