Instructions Prepare the adjusting entries at March 31, assuming that adjusting entries are made quarterly. Additional accounts are Depre- ciation Expense, Insurance Expense, Interest Payable, and Supplies Expense. (Omit explanations.) E3-6 (LO3) (Adjusting Entries) Karen Weller, D.D.S, opened a dental practice on January 1, 2017. During the first month of operations, the following transactions occurred. 1. Performed services for patients who had dental plan insurance. At January 31, $750 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 $520. 3. Purchased dental equipment on January 1 for $80,000, paying $20,000 in cash and signing a $60,000, 3-year note payable The equipment depreciates $400 per month. Interest is $500 per month. 4. Purchased a one-year malpractice insurance policy on January 1 for $12,000. 5. Purchased $1,600 of dental supplies. On January 31, determined that $500 of supplies were on hand