Question

Question is based on compound interest                             
At what rate percent compound interest does a sum of money become 2.25 times of itself in 2 years?
 please answer this question as soon as posible it is urgent

Answer 1

LET THE PRINCIPLE BE X 
then according to the question the amount will be 2.25x
given time n=2 years 
let rate be R%
now,
     A=P[1-$\frac{R}{100}$]^2
    2.25x=x[1-$\frac{R}{100}$]^2
    √2.25=1-$\frac{R}{100}$
    1.5=1-R/100
    0.5=R/100
      R=50% ans......