Wardell Company purchased a mainframe on January 1, 2019, at a cost of $51,000. The computer was depreciated using the straight-line method over an estimated five-year life with an estimated residual value of $3,000. On January 1, 2021, the estimate of useful life was changed to a total of 10 years, and the estimate of residual value was changed to $600. Required: 1. Prepare the year-end journal entry for depreciation in 2021. No depreciation was recorded during the year. (If no entry is required for a transaction/event, select "No journal entry required" in the first account field. Round your final answer to nearest whole dollar) View transaction list Journal entry worksheet Record depreciation expense for 2021. Note: Enter debits before credits Event General Journal Debit Credit 1 2. Prepare the year-end journal entry for depreciation in 2021. Assume that the company uses the sum-of-the-years' -digits method instead of the straight-line method. (If no entry is required for a transaction/event, select "No journal entry required" in the first account field. Do not round Intermediate calculations. Round your final answers to nearest whole dollar) View transaction list Journal entry worksheet Record depreciation expense for 2021. Note: Inter debit before credits General Journal Debit Event 1 Credit