The population of a town increases by 5% every year. If

The population of a town increases by 5% every year. If the present population is 9261, the population 3 years ago was

Using Rule 17,

P = P₀		1 +	R		^T
			100

⇒ 9261 = P₀		1 +	5		³
			100

⇒ 9261 = P₀		1 +	1		³
			20

⇒ 9261 = P₀			21		³
			20

⇒ P₀ =	9261 × 20 × 20 × 20	= 8000
	21 × 21 × 21