Field Industries' outstanding bonds have a 25 -year maturity and $1,000 par value. Their yield to maturity is 8.25%, they pay interest annually, and they sell at a price of $853.69. What is the bond's annual coupon rate? \begin{tabular}{l} 6.75% \\ \hline 6.85% \\ 7.50% \\ 7.65% \end{tabular}