The controller of Sunland Production has collected the following monthly cost data for analyzing the behavior of electricity costs. Total Electricity Costs Total Machine Hours January $2,490 250 February 3,000 320 March 3,530 460 April 4,740 695 May 3,160 450 June 4,900 790 July 4,130 625 August 3,890 590 September 5,170 680 October 4,220 610 November 3,290 320 December 7,530 810 Determine the fixed costs and unit variable costs using the high-low method. Total fixed costs Variable cost per machine hour +A +A 240 9 What electricity cost does the cost equation estimate for a level of activity of 460 machine hours? Electricity cost $ By what amount does this differ from March's observed cost for 460 machine hours? Amount differ +A $