Yield to Maturity and Call with Semiannual Payments

Thatcher Corporation's bonds will mature in 20 years. The bonds have a face value of $1,000 and a 12% coupon rate, paid semiannually. The price of the bonds is $850. The bonds are callable in 5 years at a call price of $1,050. Do not round intermediate calculations. Round your answers to two decimal places. What is their yield to maturity? % What is their yield to call?