High-Low Method to Determine Fixed Cost and Variable Rate McGarvey Manufacturing Company had the following 12 months of data on purchasing cost and number of purchase orders. Number of Purchase Month Purchasing Cost Orders January $19,250 370 February 18,040 320 March 18,200 340 April 18,050 410 May 19,345 400 June 19,500 450 July 19,670 460 August 21,400 600 September 19,430 440 October 20,020 570 November 18,800 470 December 19,340 480 Required: