The following is Ortega Limo Service Ltd.'s unadjusted trial balance at its year end, December 31, 2015. The company adjusts its accounts annually.

Additional information:
1. The insurance policy has a one-year term beginning March 1, 2015. At that time, a premium of $3,600 was paid.
2. A physical count of supplies at December 31 shows $570 of supplies on hand.
3. The vehicles were purchased on January 2, 2014, and have an estimated useful life of four years.
4. The furniture was purchased on July 2, 2012, and has an estimated useful life of 10 years.
5. Service revenue earned but not billed or recorded at December 31 is $1,750.
6. Interest on the 7% bank loan is paid on the first day of each following quarter (January 1, April 1, July 1, and October 1).
7. One of Ortega's customers paid $3,600 in advance for a six-month contract at the rate of $600 per month. The contract began on November 1 and Ortega credited Unearned Revenue at the time.
8. Drivers' salaries total $230 per day. At December 31, three days of salaries are unpaid.
9. On December 1, Ortega paid $2,300 ($1,150 per month) for the December 2015 and January 2016 rent in advance.
10. Income tax for the year is estimated to be $2,850. The company has paid $2,000 in income tax instalments to date.
Instructions
(a) Prepare T accounts and enter the trial balance amounts.
(b) Prepare and post the adjusting journal entries required at December 31.
(c) Prepare an adjusted trial balance at December 31.

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Debit Credit Cash Accounts receivable Supplies Prepaid insurance Prepaid rent Vehicles Accumulated depreciation-vehicles Furniture Accumulated depreciation-furniture Unearned revenue Bank loan payable, due September 1, 2019 Common shares Rstainl anins Divikns Service revenue Salaries expense Rent expense Repairs and maintenance expense Interest expense Income tax expense $ 4,600 8,220 2,500 3,600 2,300 58,000 14,500 16,000 4,000 3,600 27,475 5,000 7,600 3,800 115,600 57,000 12,650 4,690 2,415 2000 $177,775 $177,775