Please let me know what im doing wrong? The steps are appreciated!

Mountain Dental Services is a specialized dental practice whose only service is filling cavites. Mountain has recordod the following for the past nine months: 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 700 cavities. X Answer is complete but not entirely correct. Complete this question by entering your answers in the tabs below. Use the high-iow method to estimate total fixed cost and variable cost per cavity filled. (Round your Variable cost per unit to 2 decimal places.) Mountain Dontal Services is a specialized dental practice whose only service is fining cavities. Mountain has recorded the following for the past nine months: 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 700 cavities. ) Answer is complete but not entirely correct. Complete this question by entering your answers in the tabs below. Using these estimates, calculate Mountain's total cost for filing 700 cavities