Prepare December 31 year-end adjusting journal entries, as needed, for the following items. Cash of $900 was collected on December 1 of the current year, for three months of services yet to be performed. Unearned a. Service Revenue was credited when the cash was received. The company initially records payments of all insurance premiums as Prepaid Insurance. The unadjusted trial balance at year- b. end shows a balance of $4,500 in Prepaid Insurance. A review of insurance policies reveals that $2,500 of insurance is unexpired. c. Depreciation on the building for the current year is $9,000. d. At year-end, the company received a utility bill for December's utility usage of $650 that will be paid in early January. e. The Supplies account shows a balance of $5,000, but a count of supplies reveals only $4,200 on hand at year-end. f. Employees work Monday through Friday, and salaries of $8,000 per week are paid each Friday. The company's year-end falls on Wednesday.