Angora Wraps makes fine sweaters and is interested in determining the fixed and variable components their labour costs. An activity base has been identified: number units produced The following data has been gathered for the past 12 months: Required: (a) Using the high-Jow method, develop a cost formula for labour costs based on number of units produced. ( 5 marks) Activity Cost \begin{tabular}{|l|l|} \hline & \\ \hline & \\ \hline & \\ \hline \end{tabular} Required: IJeine the hieh-low method, develop a cost formula for labour costs based on number of units produced. ( 5 marks) Which method, high-low or least-squares regression, should be used? Explain why? ( 2 marks)