Question 76570
12000(1+r)^2=27000
(1+r)^2=2.25                       Divide by 12000
1+r=2.25^(1/2)                     Flip the exponent, put in on the other side 
                                   of = sign.
1+r=1.5                            simplify number with the exponent
r=.5                               subtract the 1.