Silver Lining, Inc., provides investment advisory services. The company adjusts its accounts monthly, but performs closing entries annually on December 31. The firm's unadjusted trial balance dated December 31, current year, appears as follows. Cash Accounts receivable Office supplies Prepaid rent Unexpired insurance Office equipment SILVER LINING, INC. Unadjusted Trial Balance December 31, Current Year Accumulated depreciation: office equipment Accounts payable Interest payable Income taxes payable Notes payable Unearned consulting services revenue Capital stock Retained earnings Dividends Consulting services revenue Office supplies expense Depreciation expense: office equipment Rent expense Insurance expense Salaries expense Interest expense Income taxes expense Totals $ Debits 51,402 2,400 246 1,440 324 64,800 1,200 726 9,900 4,230 1,212 32,520 Credits 42,300 1,680 432 2,100 10,800 4,200 36,000 9,600 72,000 432 8,280 $ 179,112 $ 179,112 Other Data 1. Accrued but unrecorded and uncollected consulting services revenue totals $1,800 at December 31, current year. 2. The company determined that $3,000 of previously unearned consulting services revenue had been earned at December 31, current year. 3. Office supplies on hand at December 31 total $132. 4. The company purchased all of its equipment when it first began business. At that time, the estimated useful life of the equipment was six years (72 months). 5. The company prepaid its six-month rent agreement on October 1, current year. 6. The company prepaid its 12-month insurance policy on March 1, current year. 7. Accrued but unpaid salaries total $2,280 at December 31, current year. 8. On June 1, current year, the company borrowed $10,800 by signing a 9-month, 8 percent note payable. The entire amount, plus interest, is due on March 1, next year. 9. The company's CPA estimates that income taxes expense for the entire year is $9,000. The unpaid portion of this amount is due early in the next year. Required: a-1. Prepare the necessary adjusting journal entries on December 31, current year. a-2. Prepare an adjusted trial balance dated December 31, current year. b-1. From the adjusted trial balance prepared in part a-2, prepare an income statement for the year ended December 31, current year. b-2. From the adjusted trial balance prepared in part a-2, prepare the statement of retained earnings for the year ended December 31, current year. b-3. From the adjusted trial balance prepared in part a-2, prepare the company's balance sheet dated December 31, current year. c. Prepare the necessary year-end closing entries. d. Prepare an after-closing trial balance. e. Compute the company's average monthly insurance expense for January and February of current year. f. Compute the company's average monthly rent expense for January through September of current year. g. If the company purchased all of its office equipment when it first incorporated, for how long has it been in business as of December 31, current year?