Methow Valley Inc. has bonds on the market making annual payments, with $20$ years to maturity, and selling for $$850.$ At this price, the bonds yield $4\mathrm{.}5$ percent. What must the coupon rate be on the bonds in percentage? Sample answer format: enter $3\mathrm{.}24$ for $3\mathrm{.}24\%$ and NO $\%$ sign.