Sandhill company uses a job cost system and applies overhead to the production on the basis of direct labor costs. On January 1, Job 50 was the only job in process. Direct materials 19600, direct labor 11,760, and manufacturing overhead 15680. calculate the predetermined overhead rate assuming sandhill company estimates total manufacturing overhead costs of 823,200, direct labor costs of 686,000 and direct labor hours of 19,600 for the year