A depreciable asset with a cost of $47960 has a residual value of $2600 and a useful life of 6 years. Total estimated units of output are 75600 and in year 1 a total of 5400 units were produced. Under the straight-line method and the units-of-activity method the depreciation expense for the first year would be Straight-line Units-of-activity $7560.00 $756000 $7993.33$3425.71 $7993.33$3240.00