Year Activity level Total XY X2 (Units) maintenance cost 2009 6,500 14,500 2010 8,000 16.200 2011 9,000 17,000 2012 6,000 14,000 2013 7,500 16,000 1. High-Low Method a. Find the cost function for the following activities by calculating the: i. Variable cost per unit ii. Fixed cost b. The total maintenance cost that should be expected in 2014 if output is 8,500 units 2. Lease square regression a. Find the cost function for the following activities by calculating the: i. Variable cost per unit ii. Fixed cost b. The total maintenance cost that should be expected in 2014 if output is 8.500 units