Chamberlain Co$.$ wants to issue new $20-$year bonds for some much$-$needed expansion projects. The company currently has $5$ percent coupon bonds on the market that sell for $$997,$ 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?

$($Enter your answer as a percentage, omit the $"\%"$ sign in your response, and enter your answer with two decimal places. For example, $1\mathrm{.}214\%$ should be entered as $1\mathrm{.}21.)$