The population of a town increases by `25%` annually. If the present population is one crore, then what was the difference between the population 3 years ago and 2 years ago ?

Explanation

(i) `25%` increase from 1st year to 2nd year is equal to `20%` decrease from second year to the first year.
(ii) Let `P(1+(r)/(100))^(n)=1` crore, where `r=25%.`
(iii) Find P, when r = 3 and r=2.
(iv) Find the difference in the value of P in both the cases.