A machine has a first cost of $10,000. End-of-year book values, salvage values, and annual O&M costs are provided over its useful life as given in Table P14.32
Table P14.32

(a) Determine the economic life of the machine if the MARR is 15% and the marginal tax rate is 40%.
(b) Determine the MARR mains at 40

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Salvage Value 55.300 3,900 2.800 1,800 1.400 600 Year End Operating Costs Book Value $8,000 4,800 2.880 1,728 576 $1,500 2,100 2,700 3.400 4,200 4,900