Suppose the December CBOT Treasury bond futures contract has a quoted price of 89-09. The T-bond is a 20-year 6% coupon bond and the interest is paid semi-annually. What is the implied annual interest rate inherent in the futures contract?
a. 6.32%
b. 6.65%
c. 7.00%
d. 7.35%
e. 7.72%