A medical device costs $50.000. Operating, maintenance, and repair costs are $10,000 for the first year, $25,000 for the second year, S40,000 for the third year, and $55.000 for the fourth year. The minimum attractive rate of return is 10%. The device should be replaced every A medical device costs $50.000. Operating, maintenance, and repair costs are $10,000 for the first year, $25,000 for the second year, S40,000 for the third year, and $55.000 for the fourth year. The minimum attractive rate of return is 10%. The device should be replaced every