2xPon April 1, 2021, Parks Co. purchased a machine at a cost of $84,000. The machine is expected to have a useful life of 5 years and to have a residual value of $12,000. The machine is expected to produce a total of 100,000 units. During 2021 the machine produced 13,000 units. Parks Co. has a December 31 year-end and uses the closest full month convention as applicable for recording depreciation for partial periods. Required: a. Compute depreciation expense for the fiscal years ended December 31, 2021 and 2022 assuming double-declining balance method is used. 4.000-12.000 = 72.000 b. Compute depreciation expense for the fiscal year ended December 31, 2021 assuming the units of production method is used