Lombardi Company sells 3 types of bags. Bag A sells for $15 and has variable cost of $9.00 per unit. Bag B sells for $12 and has variable cost of $12.00 per unit. Bag C sells for $6 and has variable costs of $6.00 per unit. Lombardi sells in a mix of 2 units of A, 3 units of B and 5 units of C. What is the weighted average contribution margin per unit for Lombardi?