Debit Credit

Supplies 700

Prepaid Insurance 2,400

Salaries and Wages Payable 800

Unearned Service Revenue 750

Supplies Expense 950

Insurance Expense 400

Salaries and Wages Expense 1,800

Service Revenue 2,000

Answer the following questions , assuming the year beginning January 1 (Please prove an explanation)

(a) If the amount in Supplies Expense is the January 31 adjusting entry, and $850 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 1 year, what was the total premium.

(c) If $2,500 of salaries was paid in January, what was the balance in Salaries Payable at December 31, 2009?

(d) If $1,800 was received in January for services performed in January, what was the balance in Unearned Service Revenue at December 31, 2009?