A partial "adjusted" trial balance of Marine Repair Company at January 31, 2021, shows the following. Marine Repair Company Adjusted Trial Balance (partial) January 31, 2021 Supplies... Prepaid Insurance Salaries and Wages Payable Unearned Revenue Supplies Expense.. Insurance Expense.. Salaries and Wages Expense Service Revenue. Debit Credit $ 2,100 9,600 $1,310 3,000 2,960 2,400 9,150 19,880 Required: Answer the following questions, assuming the accounting year begins January 1st.