A partial adjusted trial balance of Rooney Sports at January 31, 2020, shows the following. ROONEY Sports Adjusted Trial Balance January 31, 2020 Debit Credit Supplies 800 Prepaid Insurance 1,800 Salaries and Wages Payable 900 Unearned Service Revenue 850 Supplies Expense 800 Insurance Expense 300 Salaries and Wages Expense 3,200 Service Revenue 3,400 Answer the following questions, assuming the year begins January 1. (a) If the amount in Supplies Expense is the January 31 adjusting entry and 1,200 of supplies was purchased in January, what was the balance in Supplies on January 1? The balance in Supplies on January 1 (b) If the amount in Insurance Expense is the January 31 adjusting entry and the original insurance premium was for one year, what was the total premium and when was the policy purchased? The total premium The policy purchased (c) If 3,700 of salaries was paid in January, what was the balance in Salaries and Wages Payable at December 31, 2019? The balance in Salaries and Wages Payable at December 31, 2019