I am only strugging with a and c

Calculate the yield to maturity on bonds: a. A 9.8 percent coupon (paid semi-annually) bond, with a $1,000 face value and 23 years remaining to maturity. The bond is selling at $945. b. An 10.3 percent coupon (paid each quarter) bond, with a $1,000 face value and 10 years remaining to maturity. The bond is selling at $905. c. An 9.3 percent coupon (paid annually bond, with a $1,000 face value and 10 years remaining to maturity. The bond is selling at $1,055 (For all requirements, do not round intermediate calculations. Round your answers to 3 decimal places. (e.g., 32.161)) a. Yield to maturity b. Yield to maturity C. Yield to maturity 10.440 % per year 11.940 % per year 8.460% per year