4. 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. The inflation rate is 6% per year and the company's MARR is 11% per year. Determine (a) the depreciation charge for year 3, (b) the present worth of the third-year depreciation charge in year 0, the time of asset purchase, and (c) the book value for year 3 according to the straight line method. 5. Equipment for immersion cooling of electronic components has an installed value of $182,000 with an estimated trade-in value of $40,000 after 15 years. For years 2 and 10, use DDB book depreciation to determine (a) the depreciation charge and (b) the book value