Carol Garcia owns and operates a home health care agency. She reported the following cost information for the first four months in 2019. Home Visits 12,000 17,000 22,000 27,000 Employee wages ? $170,000 $220,000 $270,000 Billing services ? $71,400 $91,900 $112,400 Medical supplies $144,000 $204,000 $264,000 ? Insurance $15,000 $15,000