1. The controller of XYZ Company Limited is concerned about how much the company's costs have risen over the past few months. Since the majority of the company's costs are mixed, it is hard to tell if the increasing costs are due to variable costs or fixed costs. a) List and explain the different methods that can be used to separate a mixed cost into its different components. 7 marks b) Provide one advantage and one disadvantage of each method. 3 marks