The Tomac Swim Club arranged short-term financing of $14000 on July 9 with the Bank of Commerce and secured the loan with a demand note. The club repaid the loan by payments of $ 6800 on September 13, $3100 on November 26, and the balance on December 30. Interest, calculated on the daily balance and charged to the club's current account on the last day of each month, was at 10% per annum on July 9. The rate was changed to 10.5% effective September 1 and to 11.5% effective December 1. How much interest was paid on the loan