Required information [he following information applies to the questions displayed below.] On October 1, 2021, the Allegheny Corporation purchased equipment for $233 , 000 . The estimated service life of the equipment is 10 years and the estimated residual value is $2 , 000 . The equipment is expected to produce 420,000 units during its life. Required: Calculate depreciation for 2021 and 2022 using each of the following methods. Partial-year depreciation is calculated based on the number of months the asset is in service. 2. Double-declining-balance