2. A certain machine costs $20,000 and has a life of 4 years and a salvage value of $5,000. The production output of this machine in units per year for first year 1800 units, second year 2200 units, third year 3000 units, fourth year 4000 units. If the units produced are of uniform quality, what is the annual depreciation charge for the 3rd year? (b) $10,500 (a) $7,700 (c) $14,000 (d) $6,300