Wardell Company purchased a mainframe on January 1, 2019, at a cost of $57,000. The computer was depreciated using the straight-line method over an estimated five-year life with an estimated residual value of $6,000. 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 $1,200. 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 View journal entry worksheet Event Debit Credit No 1 General Journal Depreciation expense Accumulated depreciationcomputer