The local ice cream shop sells single-scoop cones for $1.90 each. Its variable costs include the ice cream itself ($0.25 per scoop) and the cone ($0.05 per cone). The store manager plus one full-time and two part-time employees cost the business $3.630 per month in labor costs. Additional costs for rent and insurance come to $520 per month. What is the contribution margin per unit of a single-scoop cone? (Round answer to 2 decimal places, eg. 15.25.) Contribution margin $ /unit