For each of the following depreciable assets, determine the missing amount (?). Abbreviations for depreciation methods are SL for straight line and DDB for double-declining balance. Residual Service Life Depreciation Depreciation Asset Cost Value (Years) Method (Year 2) 4 8 $24,000 ? 6,000 12,000 24,000 $ 60,000 78,000 276,000 240,000 ? DDB SL SL 22 DDB $30,000 7,000 9,000 33,000 0000