Southern production company has 100 labor-hours available. there is no limit on machine-hours. southern can sell all of b it wants, but it can only sell 45 units and 20 units of a and c, respectively. product a product b product c contribution margin per unit $15 $10 $12 labor-hours per unit 2.5 2.5 2 machine-hours per unit 5 3.5 1 what is the contribution margin per labor-hour for product a? contribution margin per labor-hour($15/2.50)=$6 per hour what is the contribution margin per labor-hour for product b? contribution margin per labor-hour($10/2.5)=$4 per hour what is the contribution margin per labor-hour for product c? contribution margin per labor-hour($12/2)=$6 per hour how many units of product a should the company make? 45 units how many units of product b should the company make? how many units of product c should the company make?