From April 1 through October 31, Will County Highway Department hires temporary employees to mow and clean the right-of-way along county roads. The County Road Commissioner has asked you to help her in determining the variable labor cost of mowing and cleaning a mile of road. The following information is available regarding current-year operations: Month Miles Mowed and Cleaned Labor Costs April 350 $8,000 May 300 7,500 June 400 9,000 July 250 5,500 August 375 8,500 September 200 5,000 October 100 4,800