A bank made a loan of $27,000.00 on March 7 to Person X to purchase equipment for their office. The loan was secured by a demand loan subject to a variable rate of interest that was 7% on March 7. The rate of interest was raised to 7.5% effective July 1 and to 7.75% effective September 1. Person X made partial payments on the loan as follows: $1000 on May 12; $600 on June 30; and $300 on October 11. Each payment is first applied to any accumulated interest. Any remainder is then used to reduce the outstanding principal. The terms of the note require payment on October 31 of any interest not paid off by partial payments. How much must Person X pay on October 31?