Wonkaland has a 10 percent, semiannual coupon bond outstanding with a current market price of $985.20. The bond has a par value of $1,000 and matures in 19 years. What is the yield to maturity of this bond?

A municipal security issued by Londons local government has an 11 percent coupon rate and makes semiannual payments. The bond is currently priced at $863.75 with a face value of $1,000. The yield to maturity on the bond is 12.8 percent. How many years is it until this bond matures?