On January 1, 2021, the Allegheny Corporation purchased equipment for $331,000. The estimated service life of the equipment is 10 years and the estimated residual value is $23,000. The equipment is expected to produce 292,000 units during its life. Required: Calculate depreciation for 2021 and 2022 using each of the following methods. 3. Assume instead the equipment was purchased on October 1, 2021. Calculate depreciation for 2021 and 2022 using each of the two methods. Partial-year depreciation is calculated based on the number of months the asset is in service.