Refer to the following data and calculate the following (show all workings) a. Total manufacturing costs (2 marks) b. Total period costs (2 marks) c. Total prime costs (2 marks) $150 000 Direct material used $5000 $7000 Selling costs Indirect labour Administrative costs $10 000 $70 000 $40 000 Depreciation on factory equipment Direct labour Overtime premiums paid Indirect materials $20 000 $45 000 The following information on purchasing costs and the number of purchase orders has been provided. Use the high-low method to estimate the cost equation. Month Total Purchasing Costs Number of purchase orders July $1,539,000 7,485 August $1,538,000 7,586 September $547,000 1,433 October $1,100,000 2,550