The following information pertains to Grayson Industries for May 2019: Beginning direct materials $20,000 Beginning finished goods 26,000 Beginning work in process 21,000 Cost of goods sold 165,000 Direct materials purchases 53,000 Ending direct materials 18,000 Ending finished goods 23,000 Ending work in process 12,000 Factory overhead 46,000 Gross profit 70,000 Selling and administrative expenses 35,000 Assume an income tax rate of 25 percent. Required: Determine the following values: a. Net operating income b. Cost of goods manufactured c. Total manufacturing costs added d. Sales e. Direct materials used f. Direct labor g. Conversion costs h. Prime costs After-tax net income