Yield to call

Seven years ago the Templeton Company issued 17-year bonds with a 12% annual coupon rate at their $1,000 par value. The bonds had a 7% call premium, with 5 years of call protection. Today Templeton called the bonds.

Compute the realized rate of return for an investor who purchased the bonds when they were issued and held them until they were called. Round your answer to two decimal places. Please write all the steps, notations and explanations clearly.