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. Exercise 11-23 (Algo) Part 1 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