Suppose you are choosing between two pieces of excavating equipment. Deere A costs $100,000 today and requires maintenance costs of $10,000 a year for four years the useful life of the equipment assuming normal use. Deere B costs $80,000 today plus $12,000 a year for 7 years, the useful life assuming normal use. Assume the appropriate discount rate is 10%. Which project should you choose? can you please explain to get 3.17? needs step by step details. thanks