On January 1, a company issued 6%, 15-year bonds with a face amount of $100 million for $90,803,977.29 to yield 7%. Interest is paid semiannually. What was interest expense at the effective interest rate on June 30, the first interest date? (Enter your answers in whole dollars. Round percentage answers to 2 decimal places. (i.e., .0234 should be entered as 2.34).)