Nikita Enterprises has bonds on the market making annual payments, with $15$ years to maturity, a par value of $$1,000,$ and selling for $$966.$ At this price, the bonds yield $7\mathrm{.}8$ percent. What must the coupon rate be on the bonds?

Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

$\%$