Chamberlain Co$.$ wants to issue new $20-$year bonds for some much$-$needed expansion projects. The company currently has $7\mathrm{.}8$ percent coupon bonds on the market that sell for $$961\mathrm{.}00,$ make semiannual payments, and mature in $20$ years. What coupon rate should the company set on its new bonds if it wants them to sell at par? Assume a par value of $$1,000$