1. Compute Northeast's depreciation for the first two years on the plane using the straight-line method, the units-of-production method, and the double-declining balance method. a. Straight-line method Using the straight-line method, depreciation is for 2020 and for 2021. b. Units-of-production method (Round the depreciation per unit of output to two decimal places to compute your final answers.) Using the units-of-production method, depreciation is for 2020 and for 2021 . c. Double-declining balance method Using the double-declining-balance method, depreciation is for 2020 and for 2021