After graduating from dental school two years ago, Dr. Lauren Farish 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 In January of this year she had to replace the outdated autoclave equipment she inherited from the previous dentist.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		742			$7,486
February		642			6,548
March		842			7,000
April		1,042			9,054
May		942			7,708
June		1,142			8,592
July		1,342			10,162
August		1,242			9,836

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

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What is the fixed cost of the autoclave equipment? (Round answer to 0 decimal places, e.g. 5,275.)

Fixed cost

$

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What is the cost formula that Dr. Farish should use for estimating autoclave sterilization costs for next years budget?

Formula of total cost

($3,235 # of instruments) - $5.16($3,235 # of instruments) - $5.16($3,235 # of instruments) + $5.16($3,235 # of instruments) + $5.16($5.16 # of instruments) - $3,235($5.16 # of instruments) + $3,235($5.16 # of instruments) + $3,235($5.16 # of instruments) - $3,235

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If Dr. Farish estimates she will use 1,207 instruments next month, what cost should she include in her budget for instrument sterilization? (Round answer to 0 decimal places, e.g. 5,275.)

Total cost

$