In December 2002, DoubleDown, Inc. issued $100 million in bonds.  These bonds originally had a 20 year maturity, a 9.5% coupon rate, and semi-annual interest payments on a $1,000 Par value.  When they originated, the bonds sold at par.  Since origination, the required rate of return on DoubleDown bonds has hovered between a low of 6.75% to a high of 11.5% and currently sell at par value.  

What is the current cost of debt (rd)for DoubleDown?