You invested $$10,000$ in a mutual fund ten years ago. The investment is worth $$32,000$ today. If the interest was compounded annually, what is the annual rate of return earned on the investment?

a$.13\mathrm{.}01\%$

b$.12\mathrm{.}67\%$

c$.13\mathrm{.}31\%$

d$.11\mathrm{.}56\%$

e$.12\mathrm{.}34\%$