Required Information [The following Information applies to the questions displayed below.] Phillips Company manufactures air-conditioning units for commercial buildings and has noticed considerable variation In shipping expenses from month to month as per the data below: Total Units Shipping Month Shipped Expense January 4 $ 1, 880 February $ 2,780 March $ 2, 200 April $ 1, 242 DOWNUA May $ 1,950 June $ 2, 520 July $ 3,552 2. Using the high-low method, what is the variable cost per unit to ship air conditioners? Variable cost per unit