The controller of Cullumber Production has collected the following monthly cost data for analyzing the behavior of electricity costs. (a) Your answer is correct. Determine the fixed costs and unit variable costs using the high-low method. Total fixed costs Variable cost per machine hour eTextbook and Media $ $ Attempts: 2 of 3 used I Lab Assignment Question 9 of 20 1.67/5; x Your answer is incorrect. What electricity cost does the cost equation estimate for a level of activity of 500 machine hours? Electricity cost $ By what amount does this differ from March's observed cost for 500 machine hours? Amount differ $ eTextbook and Media Solution Attempts: 3 of 3 used (c) What electricity cost does the cost equation estimate for a level of activity of 750 machine hours? Electricity cost $ By what amount does this differ from June's observed cost for 750 machine hours? Amount differ $