Cheng, D.D.S., opened a dental practice on January 1, 2014. During the first month of operations the following transactions occurred.
1. Performed services for patients who had dental plan insurance. At January 31, $375 of such services was performed but not yet billed to the insurance companies.
2. Utility expenses incurred but not paid prior to January 31 totaled $260.
3. Purchased dental equipment on January 1 for $40,000, paying $10,000 in cash and signing a $30,000, 3-year note payable. The equipment depreciates $200 per month. Interest is $250 per month.
4. Purchased a one-year malpractice insurance policy on January 1 for $6,000.
5. Purchased $800 of dental supplies. On January 31, determined that $250 of supplies were on hand.

Instructions
Prepare the adjusting entries on January 31. Account titles are:
Accumulated Depreciation—Equipment ...... Interest Payable
Depreciation Expense .............. Prepaid Insurance
Service Revenue ................ Supplies
Accounts Receivable .............. Supplies Expense
Insurance Expense ................ Utilities Expense
Interest Expense ................ Utilities Payable