The controller of Ivanhoe Production has collected the following monthly expense data for analyzing the cost behavior of electricity costs. Total Total Electricity Costs Machine Hours January $2,300 270 February 2,920 390 March 3,500 500 April 4,780 690 May 3,230 450 June 4,920 790 July 4,010 625 August 3,870 530 September 5,050 665 October 4,260 625 November 3,220 390 December 6,080 810