The accountant for Austin Community Clinic, an outpatient clinic serving primary care needs, has gathered the following monthly expense amounts for two levels of patient activity 400 Patient Visits 800 Patient Visits Total Cost Total Cost Office supplies $208 $336 Medical assistant's earnings $5,712 $7,024 Insurance on building $128 $128 Advertising expense $256 $512 Medical supplies $4.128 $8,250 Physician's earnings $12.984 $12.984 The Physician's Earnings cost item is a Fixed cost Variable cost Maed cost