Problems: 1. Swan Ltd is a manufacturer with the following information available at year-end: Direct material used Salary of the managing director Direct labour Administrative cost Manufacturing overhead $ 400,000 70,000 180,000 140,000 40,000 Required a) Calculate the total prime costs for the year b) Calculate the total conversion costs for the year. c) Calculate the total period costs for the year. d) Calculate the total product costs for the year