Answer: The journal entries to record depreciation on December 31, 2019 is:
Debit Depreciation expense $5,000
Credit Accumulated depreciation $5,000
(To recognize depreciation expense)
Explanation: Using a straight-line depreciation method with the formula below: (Cost - salvage value) / No of years
Depreciation expense = ($90,000 - $10,000) / 8 years = $10,000 yearly
From July 1, 2019 - December 31, 2019 (6 months), depreciation expense is $10,000 X 6/12 = $5,000. This holds for 2019 till 2021 - so the accumulated depreciation would have been $25,000.
The revision of the estimate in 2022 can be adopted prospectively, using the net book value of $65,000, hence there is no need to readjust the previously charged depreciation expense.