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Public Medical Center bought equipment on January 2 for $45,000. The equipment was expected to remain in service for four years and to perform 1,750 operations. At the end of the equipment's useful life, Public estimates that its residual value will be $10,000. The equipment performed 175 operations the first year, 525 the second year, 700 the third year, and 350 the fourth year. Requirement 1. Prepare a schedule of depreciation expense per year for the equipment under the three depreciation methods. After two year under double-declining balance depreciation, the company switched to the straight-line method