Answer:
1. The journal entry needed in 2021 to correct the error in depreciation recorded in 2019 is:
Debit Depreciation Expense (building) $18,000
Credit Accumulated Depreciation (building) $18,000
This entry increases Depreciation Expense by $18,000 for 2019 (the amount that was under-recorded), and decreases Accumulated Depreciation by the same amount.
2. Assuming no change in estimate of useful life or residual value, the depreciation on the building for 2021 would be $408,000 ($10.2 million - $2.2 million residual value, divided by 25 years). This is calculated using the straight-line method, which allocates the depreciable cost of the building evenly over its useful life.
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