Consider a firm in need of a stamping machine. It can buy a one-speed machine that requires an initial investment of $350 and produces after-tax cash inflows of $300 for each of 2 years, or it can purchase a three-speed machine that costs $1,200 and produces cash inflows of $500 for each of 4 years. Neither machine has any resale value, and the opportunity cost is 16 percent. Which machine should be purchased? (show your work)