I need help answering A-D

E #3 A partial adjusted trial balance of Rock Company at January 31, 2011, shows the following. ROCK COMPANY Adjusted Trial Balance January 31, 2011 Debit Credit 850 Supplies Prepaid Insurance 2,500 800 Salaries Payable 750 Unearned Revenue 950 Supplies Expense Expense 500 Insurance 1,700 Salaries Expense 2,000 Service Revenue Instructions Answer the following questions, assuming the year begins January 1 (a) If the amount in Supplies Expense is the January 31 adjusting entry, and $1,500 of supplies was purchased in January, what was 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? (c) If $3,500 of salaries was paid in January, what was the balance in Salaries Payable at December 31, 2010? (d) If $1,650 was received in January for services performed in January, what was the balance in Unearned Revenue at December 31, 2010