Riverbed Corporation owns machinery that cost $23,600 when purchased on July 1, 2017. Depreciation has been recorded at a rate of $2,832 per year, resulting in a balance in accumulated depreciation of $9.912 at December 31, 2020. The machinery is sold on September 1, 2021, for $12.390. Prepare journal entries to (a) update depreciation for 2021 and (b) record the sale. (Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter O for the amounts.) No. Account Titles and Explanation (a) (b) Debit Credit