Fill in the blank question.\ Product ABC has a contribution margin per unit of $10.00. Each unit of ABC requires 5 minutes of machine time and 10 minutes of labor time. Product XYZ has a contribution margin per unit of $15.00 and each unit requires 10 minutes of machine time and 5 minutes of labor time. If the company's constraint is labor hours, the contribution margin per unit of constraint for Product XYZ is $\ per minute.