Elena bought a car priced at $12,678 for 5% down and equal monthly payments for 6 years. If interest is 6% compounded semi-annually, what is the size of the monthly payment? The size of the monthly payment is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) A contract can be fulfilled by making an immediate payment of $9437, or equal payments at the end of every six months for 6 years. What is the size of the semi-annual payments at 11% per annum compounded annually? The semi-annual payments are \$ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)