aren Weller, 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, $800 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 $590. 3. Purchased dental equipment on January 1 for $87,200, paying $23,300 in cash and signing a $63,900, 3-year note payable. (a) The equipment depreciates $470 per month. (b) Interest is $520 per month. 4. Purchased a one-year malpractice insurance policy on January 1 for $18,000. 5. Purchased $2,570 of dental supplies. On January 31, determined that $540 of supplies were on hand