Final answer:
Armstrong Inc.'s 2012 income before taxes is overstated by $28,000 due to a $20,000 overstatement of ending inventory and an $8,000 understatement of depreciation expense.
Step-by-step explanation:
To determine the impact of the errors on Armstrong Inc.'s 2012 income before taxes, we need to analyze how overstatement and understatement of ending inventory and depreciation expense affect the accounting records. The overstatement of ending inventory by $20,000 will cause the cost of goods sold (COGS) to be understated, leading to an overstatement of income. Conversely, an understatement of depreciation expense by $8,000 will cause expenses to be understated, leading to an overstatement of income as well.
Therefore, the combined effect of these errors on the 2012 income before taxes is an overstatement of $20,000 (due to inventory overstatement) plus $8,000 (due to understatement of depreciation expense), which results in a total overstatement of $28,000.
The correct answer to the question is: