S A demand loan of $7000.00 is repaid by payments of $3000.00 after two years, $3000.00 after four years, and a final payment after six years. Interest is 9% compounded semi-annually for the first two years, 10% compounded monthly for the next two years, and 10% compounded annually thereafter. What is the size of the final payment? 3. The final payment is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)