The controller of Rather Production has collected the following monthly cost data for analyzing the behavior of electricity costs. Total Electricity Costs Total Machine Hours January $2,500 300 February 3,000 350 March 3,600 500 April 4,500 690 May 3,200 400 June 4,900 700 July 4,100 650 August 3,800 520 September 5,100 680 October 4,200 630 November 3,300 350 December 5,860 720