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 400 650 575 500 300 525 325 425 625 Total Cost $5,200 6,250 6,200 5,900 5,200 6,000 5,200 5,500 6,200 July August September 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 550 cavities