Black Ltd makes two products, X and Y. Details of each product are shown below: Y X Selling price per unit 30 15 Variable labour costs (9) (3) Variable material costs Fixed costs (6) (3) (4) (4) The variable material costs consist entirely of material Z. Each X uses 3 kg and each Y uses 2 kg of Z. This material is in short supply. Black Ltd cannot vary the selling price of X. At what price must the business sell Y in order to ensure that the business is indifferent as to which product is produced? OA. 24 B. 23 C. 17 D. 30