need help! also need explanation

The ledger of Sheffield Corp. on March 31 of the current year includes the selected accounts below before adjusting entries have been prepared. Debit Credit Supplies $6,000 Prepaid Insurance 7,200 Equipment 50,000 Accumulated Depreciation-Equipment $16,800 Notes Payable 40,000 Unearned Rent Revenue 24,800 Rent Revenue 120,000 Interest Expense Salaries and Wages Expense 28,000 ULTUULIU VA III An analysis of the accounts shows the following. 1. The equipment depreciates $560 per month. 2. Half of the unearned rent revenue was earned during the quarter. 3. Interest of $800 is accrued on the notes payable. 4. Supplies on hand total $1,700. 5. Insurance expires at the rate of $800 per month. Prepare the adjusting entries at March 31, assuming that adjusting entries are made quarterly. (If no entry is required, select "No Entry" for the account titles and enter for the amounts. Credit account titles are automatically indented when the amount is entered. Do not indent manually.) Date Account Titles and Explanation Debit Credit Mar. Depreciation Expense 1,120 31 Accumulated Depreciation Equipment Accumul 16,800 Mar. Unearned Rent Revenue 24,800 31 Rent Revenue 120,000 Mar. Interest Expense Interest Payable 800 Mar. Supplies Expense 1,700 31 Supplies 6,000 Mar. Insurance Expense 800 31 Prepaid Insurance 7,200