Grove Co. acquired a production machine on January 1, 2019, at a cost of $525,000. The machine is expected to have a four-year useful life with a salvage value of $98,000. The machine is capable of producing 68,000 units of product in its lifetime. Actual production was as follows: 14,960 units in 2019; 21,760 units in 2020: 19,040 units in 2021; 12,240 units in 2022. Following is the comparative balance sheet presentation of the net book value of the production machine at December 31 for each year of the asset's life, using three alternative depreciation methods fitems a-c): Required: Identify the depreciation method used for each of the following comparative balance sheet presentations (items a-c). If a declining-balance method is used, be sure to indicate the percentage (150% or 200%). (Hint Read the balance sheet from right to left to determine how much has been depreciated each year. Remember that December 31, 2019, is the end of the first year.) Depreciation Method Production Machine. Net of Accumulated Depreciation At December 31 2022 2021 2020 98.000 174,560 204,420 98,000 98.000 131,250 08.000 204,750 311,500 POP 2019 431.000 262.500 418.250