Please help me complete this.

I have been struggling for quite some time, and mainly I need the answer.

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19) AZA Company purchased a machine on July 1, 2019. The machine cost $400,000 and has an estimated residual value of $40,000. The expected useful life is 8 years. The machine is to be used for 100,000 machine hours. AZA's year end is December 31. Required: a. Calculate the depreciation expense for 2019 and 2020 using the straight-line method. Also list the Accumulated Depreciation Balances at December 31, 2019 and December 31, 2020. (10 points) b. Calculate the depreciation expense for 2019 and 2020 using the units-of-production method. The machine was used for 8,000 machine hours in 2019 and 23,000 machine hours in 2020. (10 pts) c. Calculate the depreciation expense for 2019 and 2020 using the double-declining-balance method. (10 pts) d. Determine the book value of the machine at December 31, 2019 under the (a) straight-line method and (b) units-of- production, and (c) double-declining-balance method. (2 pts each for a-c) e. Write the journal entry for recording depreciation expense for year ended December 31, 2019 using the double declining balance depreciation method. (3 points)