Total Total Electricity Costs Machine Hours January $2,400 250 February 3,010 360 March 3,570 500 April 4,790 690 May 3,150 410 June 4,930 740 July 4,110 630 August 3,880 530 September 5,010 665 October 4,380 630 November 3,320 360 December 5,970 760 (a) Determine the fixed- and variable-cost components using the high-low method. Fixed-costs LA $ Variable cost per machine hour $