675 5,160 4,340 3,300 6,070 October November the fixed- and decimal places e.g. 1.25125.) Fixed costs Variable-cost What electricity cost does the cost equation estimate for a level of activity of 500 machine hours? (Round answer to 2 decimal places e.g. 1.25) By what amount does this differ from March's observed cost for 500 machine hours? (Round answer to 2 decimal places e.g. 1.25.) Amount differ