The following are selected unadjusted account balances as at December 31, 2021, the year end of Joseph's Law Firm: Accounts receivable Prepaid insurance $50,600 12,600 Salaries payable -0- Service revenue 456,000 Insurance expense Salaries expense 8,200 115,000 Additional information obtained from a review of the law firm's records: 1. Work done for clients in December that will be invoiced in January is $9,800. 2. Prepaid insurance includes $12,600 paid for a one-year policy that was effective December 1, 2021. 3. Salaries are paid monthly on the 15th of each month. The salaries earned by employees from December 16 to 31 total $5,000. Instructions a) Prepare the December 31, 2021 adjusting entries required for these items. b) Prepare the reversing entries required for January 1, 2022.