You can continue to use your less efficient old machine with an initial cost zero and a maintenance cost of $8,960 annually for the next five years. Alternatively, you can purchase a more efficient new machine for $12,000 initial cost today, plus $5,000 annual maintenance with the same 5 years life. At a cost of capital of 15%, you should: A. Keep the old machine and save $600 in equivalent annual annuity. B. Keep the old machine and save $380 in equivalent annual annuity. C. Keep the old machine and save $480 in equivalent annual annuity. D. Buy the new machine and save $480 in equivalent annual annuity. E. Buy the new machine and save $380 in equivalent annual annuity.