Calculate the amount of depreciation expense that Riverbed should record for Machine B each year of its useful life under the following assumptions. (Round depreciation cost per unit to 2 decimal places, e.g. 12.25. Round final answers to 0 decimal places, e.g. 2,125.) (1) Riverbed uses the straight-line method of depreciation. (2) Riverbed uses the declining-balance method. The rate used is twice the straight-line rate. (3) Riverbed uses the units-of-activity method and estimates that the useful life of the machine is 113,400 units. Actual usage is as follows: 2022,45,000 units; 2023,33,000 units; 2024,21,000 units; 2025,14,400 units. Calculate the amount of depreciation expense that Riverbed should record for Machine B each year of its useful life under the following assumptions. (Round depreciation cost per unit to 2 decimal places, e.g. 12.25. Round final answers to 0 decimal places, e.g. 2,125.) (1) Riverbed uses the straight-line method of depreciation. (2) Riverbed uses the declining-balance method. The rate used is twice the straight-line rate. (3) Riverbed uses the units-of-activity method and estimates that the useful life of the machine is 113,400 units. Actual usage is as follows: 2022,45,000 units; 2023,33,000 units; 2024,21,000 units; 2025,14,400 units