Boise, Inc. makes two products Product X sells for $6.00 per unit and has variable costs of $3.00 per unit. Product Y sells for $3.50 per unit and has variable costs of $2.00 per unit. Boise sells 3 units of Product X for every 2 units of Product that it sells. What is the weighted-average contribution margin of the mix? (Round any intermediato calculations and your final answer to the nearest cent.) O A. $2.25 per unit O B. $4.75 per unit C. $2.40 per unit OD. $4.50 per unit