Current Attempt in Progress At the end of its first year, the trial balance of Sandhill Company shows Equipment $21,900 and zero balances in Accumulated Depreciation-Equipment and Depreciation Expense. Depreciation for the year is estimated to be $3.900. (a1) Prepare the annual adjusting entry for depreciation at December 31. (List debit entry before credit entry. If no entry is required, select "No Entry" for the occount titles and enter 0 for the amounts. Credit account titles are outomatically indented when the amount is entered. Do not indent manually) Post the adjustments to T-accounts. At the end of its first year, the trial balance of Sandhill Company shows Equipment $21,900 and zero balances in Accumulated Depreciation-Equipment and Depreciation Expense. Depreciation for the year is estimated to be $3,900