Please help me with this, I don't know how to slove the f) for Requirement 1 and Requirement 2 & 3. Thanks so much!

Trevor Electronics Company Unadjusted Trial Balance March 31, 2018 Balance Account Title Cash Accounts Receivable Merchandise Inventory Office Supplies Equipment Accumulated Depreciation-Equipment Accounts Payable Unearned Revenue Notes Payable, long-term Common Stock Retained Earnings Dividends Debit Credit $ 15,000 38,400 46,100 5,600 134,000 $ 37,300 16,700 13,600 50,000 30,000 23,400 15,000