Dirk Ward borrowed $14,000.00 for investment purposes on May 6 on a demand note providing for a variable rate of interest and payment of any accrued interest on December 31. He paid $800 on June 6, $100 on September 23, and $900 on November 26. How much is the accrued interest on December 31 if the rate of interest was 4% on May 6, 4.3% effective August 1, and 4.7% effective November 1

The accrued interest on December 31 is $