You are considering the purchase of a new laser cutting machine with an initial cost of $200,000, estimated operation and maintenance (O&M) costs of $60,000 this year and increasing by $20,000 per year. Salvage value is estimated to be $125,000 if you sell it at any time over the next several years. Your firm uses an MARR of 10%. a) What is the optimal economic life for the new machine? b) Your firm's current laser cutting machine has an EUAC of $111,000 at its optimal economic life, should you buy the new machine