Jack$-$n$-$Jill Co$.$ bond sells for $$904.$ The bond matures in $20$ years, has annual payments, a face value of $$1,000,$ and a yield to maturity of $8\mathrm{.}5\%.$ What is the bond's coupon rate, in $\%,$ to the nearest $0\mathrm{.}01\%?$ Drop the $\%$ symbol. E$.$g$.,$ if your answer is $0\mathrm{.}05835($i$.$e$.,5\mathrm{.}835\%),$ record it as $5\mathrm{.}84.$