The Wall Street Journal reports that the current rate on 10 year Treasury bonds is 7.25 percent, on 20-year Treasury bonds it's 7.85 percent, and on a 20-year corporate bond issued by MHM Corp. it's 8.75 percent. Assume that the maturity risk premium is zero. If the default risk premium and liquidity risk premium on a 10-year corporate bond issued by MHM Corp. are the same as those on the 20-year corporate bond, calculate the current rate on MHM Corp's 10-year corporate bond.