After graduating from dental school two years ago, Dr. Karen White purchased the dental practice of a long-time dentist who was retiring. In January of this year, she had to replace the outdated autoclave equipment she inherited from the previous dentist. Now, as she is preparing her budget for next year, she is concerned about understanding how her cost for sterilizing her dental instruments has changed. She has gathered the following information from her records: Month Number of instruments used 850 Total autoclave cost $7,595 6,950 750 920 8,087 950 January February March April May June July August 1,150 900 8,540 9,430 8,018 9,285 1,050 975 8,501 Using the high-low method, what is the variable cost of sterilizing an instrument using the new equipment? (Round answer to 2 decimal places, e.g. 52.75.) $ Variable cost per instrument T