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	350	$5,200
February	475	5,750
March	450	5,600
April	425	5,550
May	625	6,050
June	525	6,100
July	500	5,700
August	650	6,100
September	375	5,250

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 400 cavities.