One of your friends attended a management accounting briefing seminar recently. In that seminar the presenter stated that managers are only ever able to make the right decision by looking exclusively at relevant costing. The presenter also commented that full cost never helped any manager to reach the 'right' decision. Your friend has returned confused and has asked for your help. Required (Up to 500 words limit) Critique the presenter's statement. In so doing explain and illustrate how relevant costs and full costs are compiled and how each does and does not help in decision making. (15 marks)