PART A Bromley produces and sells phone cases, for which the following data is available: Required: a) Calculate the contribution (margin) per unit in . (3 marks) b) Calculate the number of cases the business must sell to break even. (2 marks) c) Calculate the number of cases that Bromley needs to sell in order to achieve a (2 marks) profit of 445,200. d) Calculate the margin of safety (expressed as a percentage). (2 marks) e) Define the following terms: (2 marks) i. Prime cost ii. Product costs