calculate contribution marging per unit The local ice cream shop sells single-scoop cones. The store employs a manager plus one full-time and two part-time employees, and also incurs costs for labor, rent, and insurance. Information concerning operations follows. Selling price of single-scoop cones $2.00 Unit cost of ice cream per scoop 0.25 Unit cost of cone 0.05 Monthly labor costs (salaries) 3,500 Monthly rent and insurance cost 500