After graduating from dental school two years ago, Dr. Michelle Walker 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 In January of this year, she had to replace the outdated autoclave equipment she inherited from the previous dentist.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			Total autoclave cost
January		850			$9,075
February		750			8,350
March		920			9,622
April		950			10,100
May		1,150			11,150
June		900			9,537
July		1,050			10,925
August		975			10,081

Identify the high and low points.

		Activity Level		$
High point		enter the activity level for high point		$enter the high point in dollars
Low point		enter the activity level for low point		$enter the low point in dollars

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

$enter Variable cost in dollars per instrument rounded to 2 decimal places

per instrument