$50,400 620 Month Utilities Expense # of Kilowatt Hours January February March 520 April 36,480 43,200 33,310 420 390 LIT 650 May June 52,210 35,500 36,550 400 July August September 53,650 51,100 430 690 640 Using the high-low method to analyze mixed costs and the data above, provide the cost equation that can be used to estimate Utilities Expense. b. Ebele estimates 475 kilowatt hours will be used in the next period. What is the estimate of Utilities Expense at 475 kilowatt hours? c. Although the high-low method is not the most accurate method to estimate costs, this method is often used for cost estimation. Why is the high-low method often used to estimate costs?