Final answer:
Using the straight-line method of depreciation, the annual depreciation expense for McNally's Extra Corporation's equipment is $20,000, and this amount remains constant each year regardless of hours used.
Step-by-step explanation:
The student's question involves calculating the depreciation expense of an asset using the straight-line method of depreciation for McNally's Extra Corporation. To calculate the annual depreciation expense, we first subtract the estimated residual value from the cost of the equipment and then divide by the useful life of the asset.
Here's the formula:
Annual Depreciation Expense = (Cost of Equipment - Residual Value) / Useful Life
Using the figures provided:
Annual Depreciation Expense = ($120,000 - $20,000) / 5 years
Annual Depreciation Expense = $100,000 / 5 years = $20,000 per year
The annual depreciation expense remains constant each year with the straight-line method, regardless of how many hours the equipment was used. Therefore, the debit to Depreciation Expense for the year ended December 31, 2017, would be $20,000.