First one to answer gets a ! ! the table shows the relationship between the cost of a t-shirt to a store and the retail price that the store charges for t-shirts after a markup a. is the relationship propotional. explain how you know. b. write and equation that represents the relationship. c. predict the retail price that the store will charge for a t-shirt that cost the store 9.50. justify your reasoning. table: cost($), x retail price ($), y 6.00 7.50 7.00 8.75 8.00 10.00 9.00 11.25