please help me solve the attached problem

12) A corporate bond is currently selling for $850. The bond matures in 16 years, has a face value of $1,000 and a coupon rate of 12.5%. The bond's yield to maturity is? A) 11% B) 12% C) 13% D) 14% E) 15% Answer: 13) FMA just issued $1,000 par value 20-year bonds. The bond sold for $758.18 and pay interest semi- annually. Investor's annual required rate of 9% on the bonds. What is the bonds' annual coupon rate? A) 6.75% B) 6.40% C) 6.37% D) 6.35% E) 5.28%