39. A machine which cost $500,000 is acquired on October 1, 2020. Its estimated salvage value is $50,000 and its expected life is eight years. Required: Complete the form below by determining the depreciation expense and year-end book values for 2020 and 2021 by each of the following methods, showing the figures used. A. Straight-line method B. Double-declining balance C. Sum-of-the-years'-digits 2020 $500,000 2021 $500,000 2020 $500,000 2021 $500,000 straight-line method Equipment Less: Accumulated Depreciation Year-End Book Value Depreciation Expense for the Year Sum-of-the-Years'-Digits Method Equipment Less: Accumulated Depreciation Year-End Book Value Depreciation Expense for the Year Double-Declining Balance Method Equipment Less: Accumulated Depreciation Year-End Book Value Depreciation Expense for the Year $500,000 2020 2021 $500,000