Variable-costs Attempts: 1 of 1 used (6) What electricity cost does the cost equation estimate for a level of activity of 460 machine hours? Electricity costs $ By what amount does this differ from March's observed cost for 460 machine hours? Amount differ $ Attempts:0 of 1 used mit Answer Save for Later (c) The parts of this question must be completed in order. This part will be available when you complete the part above