The table below depicts the activity for a cake bakery for each of the 12 months of a given year. Month January February March April May June July August September October November December Required: Number of Donuts Sold Total Costs 910 $ 3,550.00 1,669 $ 4,812.00 856 $ 3,284.00 886 $3,311.00 903 $ 3,425.00 1,901 $ 4,957.00 1,889 $ 4,907.00 1,111 $ 3,712.00 1,459 $ 4,322.00 1,214 $ 3,734.00 1,008 $ 3,608.00 2,006 $ 5,009.00 Using identified high and low activity levels a) Calculate variable cost per unit b) Calculate variable cost per unit c) Calculate Total cost of 1740 units sold