At the end of its first year, the trial balance of Wildhorse Company shows Equipment $22,500 and zero balances in Accumulated . Depreciation-Equipment and Depreciation Expense. Depreciation for the year is estimated to be $3,300. (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 account titles and enter O for the amounts. Credit account titles are automatically indented when the amount is entered. Do not indent manually.)