Answer:
a. Straight-line method:
Annual depreciation = (Cost - Residual Value) / Useful life
Annual depreciation = ($52,300,000 - $4,300,000) / 5 = $9,800,000
Depreciation for 2020 = $9,800,000
Depreciation for 2021 = $9,800,000
b. Units-of-production method:
Depreciation per mile = (Cost - Residual Value) / Total miles expected to be flown
Depreciation per mile = ($52,300,000 - $4,300,000) / 6,800,000 = $7.35
Depreciation for 2020 = $7.35 x 800,000 = $5,880,000
Depreciation for 2021 = $7.35 x 1,275,000 = $9,376,250
c. Double-declining balance method:
Depreciation rate = 2 / Useful life = 2 / 5 = 40%
Depreciation for 2020 = $52,300,000 x 40% = $20,920,000
Depreciation for 2021 = ($52,300,000 - $20,920,000) x 40% = $12,552,000
2. Book value at the end of the first year:
Straight-line method: $52,300,000 - $9,800,000 = $42,500,000
Units-of-production method: $52,300,000 - $5,880,000 = $46,420,000
Double-declining balance method: $52,300,000 - $20,920,000 = $31,380,000