1. A drill press was purchased 4 years ago for $40,000. Its estimated salvage value after 7 years was $5,000. The press can b sold for $15,000 today, or for $12000, $9000, or $6000 at the ends of each of the next 3 years. The annual operating and maintenance cost for the next 3 years will be $2700 for this year and then will increase by $800 per year. Using a MARR of 10%, what are the relevant cash flowsfor this machine?

What is the marginal cost for each year?