On December 31, 2013, a company issues bonds with a par value of $600,000. The bonds mature in 10 years, and pay 6% annual interest, payable each June 30 and December 31. The bonds sold at $592,000. The company uses the straight-line method of amortizing bond discounts. The company's year-end is December 31. What is total bond interest expense over the 10 year life of the bond?