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 Number of Cavities Filled Total Cost January 625 $5,600 February 700 6,000 March 500 4,500 April 425 4,100 May 450 4,500 June 300 3,200 July 375 3,500 August 550 4,900 September 575 5,400 Required: 1. Use the high-low method to estimate total fixed cost and variable cost per cavity filled. 2. Using these estimates, calculate Mountains total cost for filling 500 cavities.