Juart Corporation reported the following data for the month of December: Inventories: Beginning Ending Raw materials $26,000 $38,000 Work in process $22,000 $21,000 Finished goods $54,000 $56,000 Additional information: Sales $230,000 Raw materials purchases $78,000 Direct labor cost $24,000 Manufacturing overhead cost $58,000 Selling expense $15,000 Administrative expense $45,000 The net operating income for December was: $23,000 $83,000 $88,000 $10,000