Please show your work

Seether Co. wants to issue new 17-year bonds for some much-needed expansion projects. The company currently has 7.2 percent coupon bonds on the market that sell for $909.16, make semiannual payments, and mature in 17 years. What coupon rate should the company set on its new bonds if it wants them to sell at par?

8.50%

4.10%

8.20%

7.90%

8.10%