I'm having trouble figuring out the depreciation expense-office equipment, wages expense, and insurance expense for Req 2b. Please help and show the steps! thank you!

After the success of the company's first two months, Santana Rey continues to operate Business Solutions. The November 30,2020 , unadjusted trial balance of Business Solutions (reflecting its transactions for October and November of 2020 ) follows. Business Solutions had the following transactions and events in December 2020. December 2 Paid $960 cash to Hillside Mall for Business Solutions's share of mall advertising costs. December 3 Paid $500 cash for minor repairs to the company's computer. December 4 Received $4,850 cash from Alex's Engineering Co. for the receivable from November. December 10 Paid cash to Lyn Addie for six days of work at the rate of $120 per day. December 14 Notified by Alex's Engineering Company that Business Solutions's bid of $7,600 on a proposed project has been accepted. Alex's paid a $1,600 cash advance to Business Solutions. December 15 Purchased $1,900 of computer supplies on credit from Harris office Products. December 16 sent a reminder to Gomez Company to pay the fee for services recorded on November 8. December 20 Completed a project for Liu Corporation and received $6,175 cash. December 22-26 Took the week off for the holidays. December 28 Received $3,800 cash from Gomez Company on its receivable. December 29 Reimbursed S. Rey for business automobile mileage (500 miles at $0.27 per mile). December 31 The company paid $1,100 cash in dividends. The following additional facts are collected for use in making adjusting entries prior to preparing financial statements for the company's first three months. a. The December 31 inventory count of computer supplies shows $580 still available. b. Three months have expired since the 12-month insurance premium was paid in advance. c. As of December 31, Lyn Addie has not been paid for four days of work at $120 per day. d. The computer system, acquired on October 1, is expected to have a four-year life with no salvage value. e. The office equipment, acquired on October 1 , is expected to have a five-year life with no salvage value. f. Three of the four months' prepaid rent have expired. Required: 1. Prepare journal entries to record each of the December transactions and events for Business Solutions. 2-a. Prepare adjusting entries to reflect a through f. 2-b. Post the journal entries to record each of the December transactions from Requirement 1 and adjusting entries from Requirement