19. (8 points) Ebele Company incurred the following: Month January February March April May June July August September Utilities Expense # of Kilowatt Hours $50,400 620 36,480 420 43,200 520 33,310 390 52,210 650 35,500 400 36,550 430 53,650 690 51,100 640 a. 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?