Atlantis Fisheries issues zero coupon bonds on the market at a price of $304 per bond. Each bond has a face value of $1,000 payable at maturity in 10 years. It is callable in 5 years at a call price of $450. Using semi annual compounding, what is the yield to call for these bonds? (Round your answer to 2 decimal places. Omit the "%" sign in your response.)