Pamela borrowed $15 000.00 for investment purposes on March 12 on a demand note providing for a variable rate of interest and payment of any accrued interest on December 31. She repaid $1500.00 on June 17, $1850 on September 10, and $3000.00 on November 8. How much is the final payment on December 31 if the rate of interest was 12.5% on March 12, 9.75% effective August 1, and 7.45% effective October 1? Use the declining balance approach.