Depredation: Straight-Line and Double-Declining-Balance Sandblasting equipment acquired at a cost of $42,000 has an estimated residual value of $6,000 and an estimated useful life of 10 years. It was placed in service on January 1 of the current fiscal year, which ends on December 31, 20 r5. a. Determine the depreciation for 20rs and for 20v6 by the stratightine method. b. Determine the depreciation for 205 and for 20 re by the double-decining-balance mathod