please solve so I can check my work

Problem 5: a. An equipment cost $80,000. The market value has been declining at the rate of $15,000 yearly. The O&M costs in year 1 were $10,000 and have been increasing by $2,000 from year 2. Determine the minimum cost life of this equipment for a MARR of 10%. b. The O&M cost of an equipment is given in the table below. Determine the EUAC of this equipment in year 6. Assume a MARR of 8%. Year 1 2 3 4 5 6 O & M Cost $8,000 7,500 $6,000 $5,500 $4,500 8,000