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 July August September Number of Cavities Filled 350 425 400 600 700 500 550 525 300 Total Cost $5,050 5,500 5,300 6,300 6,600 5,850 6,150 6,100 5,000 Required: 1. Use the high-low method to estimate total fixed cost and variable cost per cavity filled. 2. Using these estimates, calculate Mountain's total cost for filling 450 cavities