please answer this correctly

A 30 -year maturity bond with face value of $1,000 makes semiannual coupon payments and has a coupon rate of 7.80%. Note: Do not round intermediate calculations. Enter your answers as a percent rounded to 3 decimal places. a. What is the yield to maturity if the bond is selling for $1,040 ? b. What is the yield to maturity if the bond is selling for $1,000 ? c. What is the yield to maturity if the bond is selling for $1,160