Required information Exercise 20-17 (Algo) Change in estimate; useful life and residual value of equipment (LO20-4] (The following information applies to the questions displayed below.] Wardell Company purchased a mini computer on January 1, 2019, at a cost of $43,400. The computer has been depreciated using the straight-line method over an estimated five-year useful life with an estimated residual value of $4,400. 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 20-17 (Algo) Part 1 Required: 1. Prepare the appropriate adjusting entry for depreciation in 2021 to reflect the revised estimate. (If no entry is required for a transaction/event, select "No journal entry required" in the first account field.)