LKM, Inc. wants to issue new 20-year bonds for some much-needed expansion projects. The company currently has 6.5 percent coupon bonds on the market that sell for $972.78, make semiannual payments, and mature in 20 years. What coupon rate should the company set on its new bonds if it wants them to sell at par? Do not use 5, commas or %. Use two decimals and full percentages