BCC has issued 6.625 percent debentures that will mature on July 15, Year 30. Assume that interest is paid and compounded annually. An investor purchased a $1,000 denomination bond for $1,020.00 on July 15, Year 1. Determine the yield to call if the bonds are called on July 15, Year 5, at $1,017.5. Round your answer to two decimal places.