27/(1+i)^12=10 solve for i
27/(1+i)^12 = 10 cross multiply
10(1+i)^12 = 27 divide both sides by 10
(1+i)^12 = 2.7 take the 12th root of both sides.
1 + i = 1.0863 subtract 1 from both sides
i = 1.0863 - 1 x 100
i = 8.63%
