Dirk Ward borrowed $$$$11$

$000\mathrm{.}00$ for investment purposes on May $25$ on a demand note providing for a variable rate of interest and payment of any accrued interest on December $31.$ He paid $$$$800$ on June $17,$$$150$ on September $9,$ and $$$$400$ on November $4.$ How much is the accrued interest on December $31$ if the rate of interest was $8\%$ on May $25,8\mathrm{.}5\%$ effective August$1,$ and $8\mathrm{.}85\%$ effective November$1?$