Chamberlain Co. wants to issue new 18-year bonds for some much-needed expansion projects. The company currently has 6.4 percent coupon bonds on the market that sell for $642.67, make semiannual payments, and mature in 18 years. What coupon rate should the company set on its new bonds if it wants them to sell at par? Assume a par value of $1,000. Multiple Choice O O O 10.90% 11.30% 11.00% 5.50% 10.70%