Mountain Dental Services is a specialized dental practice whose only service is filling cavities. Mountain has recorded the following for the past nine months: Month January February March April May June Number of Cavities Filled 650 500 625 425 600 450 575 700 350 Total Cost $6,200 5,750 5,550 5,550 5,850 5,150 6,150 6,100 5,050 August September Required 1. Use the high-low method to estimate total fixed cost and variable cost per cavity filled. (Round your answers to 2 decimal places.) Fixed Cost Variable Cost per Unit 2. Using these estimates, calculate Mountain's total cost for filling 400 cavities Estimated Total Cost