Laker Incorporated's fiscal year-end is December 31, 2024. The following is an adjusted trial balance as of December 31. Accounts Debit Credit Cash Supplies $10,200 30,000 Prepaid Rent 21,000 Accounts Payable $1,200 Notes Payable 12,000 Common Stock 31,000 Retained Earnings 7,200 Dividends 2,200 Service Revenue 55,800 Salaries Expense 18,200 Advertising Expense 11,200 Rent Expense 8,200 Utilities Expense 6,200 Totals $107,200 $107,200 Required: 1. Prepare the necessary closing entries. 2. Calculate the ending balance of Retained Earnings. 3. Prepare a post-closing trial balance