Pneumatics Engineering purchased a machine that had a first cost of $40,000, an expected useful life of 8 years, a recovery period of 10 years, and a salvage value of $10.000. The operating cost of the machine is expected to be $15,000 per year. Determine the book value for year 3 according to the stright line method. 12,000 31,000 3000 37,000