A corporate bond has a 20-year maturity and pays interest semiannually. The quoted coupon rate is 4%, and the bond is priced at par of $1,000. The bond is callable in 10 years at 105% of par. The bond's yield to call is %. Give your answer as a percent and the nearest 0.01% (e.g. write 3.25 if your answer is three and a quarter percent)