The Work-in-Process inventory account of a manufacturing firm shows a balance of $3,960 at the end of an accounting period. The job cost sheets of two uncompleted jobs show charges of $640 and $440 for materials, and charges of $540 and $740 for direct labor. From this information, it appears that the company is using a predetermined overhead rate, as a percentage of direct labor costs, of: The Work-in-Process inventory account of a manufacturing firm shows a balance of $3,960 at the end of an accounting period. The job cost sheets of two uncompleted jobs show charges of $640 and $440 for materials, and charges of $540 and $740 for direct labor. From this information, it appears that the company is using a predetermined overhead rate, as a percentage of direct labor costs, of