The following costs relate to one month's activity in Martin Company: Indirect materials $300 Rent on factory building $500 Maintenance of equipment $50 Direct material used $900 Utilities on factory $250 Direct labour $1,500 Selling expense $500 Administrative expense $300 Work in process inventory, beginning $600 Work in process inventory, ending $800 Finished goods inventory, beginning $500 Finished goods inventory, ending $200 Submission Instructions: a. Prepare a schedule of cost of goods manufactured in good form.