Please prepare journal entries and answer the following questions (a) to (c). Thank you.

Problem 2 (10 Marks) On January 1, 2019 a machine costing $330,000 with a 4-year service life and an estimated $3,000 residual value was purchased. It was also estimated that the machine would produce 50,000 units during its life. The actual units produced during its first 2 years of operation were 9,000 and 10,000 respectively. Calculate the amount of depreciation expense for the 2019 and 2020 under each of the following assumptions and prepare year end adjusting entry (a) Straight-line. (b) Double-declining-balance. (c) Units-of-production