40% Amount Increase in 8 year Amount increase in one year = 40/8 = 5% Rate of interest:- 5% For compund interest Rate of interest= 5% Time = 2 year Intrest will be :- 20:21 20:21 According to ratio method 20×20= 400u(Principal 21×21= 441 u (Amounts ) Interest :- 41 u 400u= 30000 41 u = 3075