Mountain Dental Services is a specialized dental practice whose only service is filling cavities. Mountain has recorded the following for the past nine months 300 Month January February March April May June July August September Number of cavities Filled Total Cost $5,000 600 6,150 575 6,350 450 5.400 525 6,150 550 6,050 625 6,300 325 5,200 400 5,200 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 425 cavities