What is the yield to call of a 20-year to maturity bond that pays a coupon rate of 8.52 percent per year, has a $1,000 par value, and is currently priced at $1,026? The bond can be called back in 4 years at a call price $1,091. Assume annual coupon payments.

Round the answer to two decimal places in percentage form.(Write the percentage sign in the "units" box)

You should use Excel or financial calculator.