Total Total Electricity Costs Machine Hours January February March April May June July August September October November December $2,370 3,100 3,460 4,540 3,240 4,960 4,150 3,910 5,000 4.270 3,280 6,050 230 370 450 695 400 770 625 510 665 610 370 790 The controller of Cullumber Industries has collected the following monthly cost data for analyzing the behavior of electricity costs. What electricity cost does the cost equation estimate for a level of activity of 450 machine hours? (Round unit cost and final answers to 2 decimal placese.g. 1,250.25.) Electricity costs By what amount does this differ from March's observed cost for 450 machine hours? (Round answer to 2 decimal places es. 1.25. Amount differ