A partial adjusted trial balance of Sunland Company at January 31, 2020, shows the following. SUNLAND COMPANY ADJUSTED TRIAL BALANCE JANUARY 31, 2020 Debit Credit Supplies $920 3,720 Prepaid Insurance $1,020 Salaries and Wages Payable Unearned Service Revenue 970 Supplies Expense 950 Insurance Expense 620 Salaries and Wages Expense 2,020 Service Revenue 2,220 Answer the following questions, assuming the year begins January 1. If $1,820 was received in January for services performed in January, what was the balance in Unearned Service Revenue at December 31, 2019? Assume that there are no accounts receivable. $ Beginning balance of unearned service revenue 4000