James McCulloch purchased a 20-year U.S. Treasury bond four years ago for $10,500. The bond paid 3.600 percent annual interest. Four years later he sold the bond for $10,600. (a) What is the annual interest amount for the bond? (Round your answer to 2 decimal places.) Annual interest $ (b) What is the total interest Mr. McCulloch earned during the four-year period? Total interest $ (c) What is the total return for Mr. McCulloch's bond investment? Total return $