124. Equipment costing $30,000 with a salvage value of $6,000 and an estimated life of 8 years has been depreciated using the straight-line method for 2 years. Assuming a revised estimated total life of 5 years and no change in the salvage value, the depreciation expense for year 3 would be a. $3,600. b. $8,000. c. $6,000. d. $4,800.