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. Purchasing Cost Number of Purchase Orders 370 Month January $19,250 February 18,040 320 March 18,200 340 April 18,050. 4101 May 19,345 400 June 19,500 450 July 19,670 460 August 21,400 600 September 19,430) 440 October 20,020 560 November 18,800 470 December 19,340 480 Required: