O'Brien Ltd.'s outstanding bonds have a $1,000 par value, and they mature in 25 years. Their nominal annual, not semiannual yield to maturity is 9.25%, they pay interest semiannually, and they sell at a price of $725. What is the bond's nominal coupon interest rate?

a.	7.95%
b.	6.41%
c.	5.77%
d.	6.15%
e.	7.31%