At the end of October, Helen lamented the company's situation: in the middle of production of Carla-T's most popular long-sleeve Tshirt, the company ran out of its usual collars, purchased from one main supplier. That supplier was also sold out. Carfa-T could get a slightly different premade collar, from a new supplier, at the same cost. So Helen went ahead with the order, hoping it wouldn't delay production or affect the quality of the shirts. As it turned out, the new collars failed Carla-T's quality control testing. Stuck with unwearable T-shirts, the company was also in a bind with its retail outlets, which wanted more shirts to sell! The cosis to produce this most recent batch of shirts is as follows. How much cost does Carla-T have tied up in each of these T-shirts? If it normally sells these shirts for $12 to the retailer, how much gross margin per unit does it generate on these sales? (Round answers to 2 decimal places, e.g. 15.25.) Total cost /unit Gross margin /unit