Mr. Pitkin bought a farm and promised to pay $6725 in 8 years with 7.5% simple interest and $9600 in 16 years with 9.5% simple interest. Later, Mr. Pitkin met with the lender requesting to pay $6775 at the end of 6 years and to make a final payment at the end of 13 years. Based on a simple interest rate of 12.5%, determine the amount required to settle the debt at the end of 13 years.