Dirk Ward borrowed $11,000.00 for investment purposes on May 11 on a demand note providing for a variable rate of interest and payment of any accrued interest on December 31. He paid $700 on June 11, $150 on September 18, and $400 on November 19. How much is the accrued interest on December 31 if the rate of interest was 8% on May 11, 8.4% effective August 1, and 8.9% effective November 1? The accrued interest on December 31 is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)