Computing Partial Period, Double-Declining-Balance Depreciation Silhouette Company purchased a machine that was installed and placed in service on April 1, 2020, at a cost of $54,000, including installation cost. Salvage value was estimated at $9,000. The machine is being depreciated over 10 years by the double-declining-balance method. For the year ended December 31, 2021, what amount should Silhouette report as depreciation expense? Depreciation expense for 2021: $ 8,640 X