Can someone help me with this problem? I'm having a hard time with it.

A 30-year maturity bond with face value of $1,000 makes annual coupon payments and has a coupon rate of 8.9%. (Do not round intermediate calculations. Enter your answers as a percent rounded to 3 decimal places.) a. What is the bond's yield to maturity if the bond is selling for $990? Yield to maturity b. What is the bond's yield to maturity if the bond is selling for $1,000? Yield to maturity c. What is the bond's yield to maturity if the bond is selling for $1,190? Yield to maturity