Question

after how many years the population of a city will bear its present population a ratio 36:25 if the rate of annual increase of population is 20%​

Answer 1

Answer:

let A= 36x ,and P = 25x

A=P (1+r/100)^n

36x= 25x(1+20/100)^n

(6/5)^2 = (6/5)^2

n= 2 year