Mr. Pitkin bought a farm and promised to pay $6800 in 7 years with 7.25% simple interest and $9675 in 15 years with 10.75% simple interest. Later, Mr. Pitkin met with the lender requesting to pay $6850 at the end of 5 years and to make a final payment at the end of 12 years. Based on a simple interest rate of 13%, determine the amount required to settle the debt at the end of 12 years.