The unadjusted trial balance for Swift Creek Engineering at its year end, December 31, 2017, is as follows:

Additional information:
1. Revenue of $10,440 was earned but unrecorded and uncollected as at December 31, 2017.
2. On June 1, the company purchased a one-year insurance policy.
3. Depreciation on the equipment for 2017 is $2,780.
4. A count on December 31, 2017, showed $1,750 of supplies on hand.
5. The four-month, 4% note receivable was issued on October 1, 2017. Interest and principal are payable on the maturity date.
Instructions
(a) Prepare adjusting entries for the year ended December 31, 2017.
(b) Post the adjusting entries.
(c) Prepare closing entries?

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SWIFT CREEK ENGINEERING Trial Balance December 31, 2017 Debit Credit S 8,450 Cash Accounts receivable Supplies Prepaid insurance Notes receivable Equipment Accumulated depreciation-equipment Accounts payable H. Duguay, capital H. Duguay, drawings Service revenue Salaries expense 6,250 5,260 7,440 12,000 27,800 S 8,340 4,560 34,900 53,500 112,300 39,400 $160,100 $160,100