Help me solving the following, i cant understand how to get this amswer:

Swifty Company uses a job order cost system and applies overhead to production on the basis of direct labor costs. On January 1. 2027. Job 50 was the only job in process. The costs incurred prior to January 1 on this job were as follows: direct materials $20,400, direct labor $12,240, and manufacturing overhead $16,320. As of January 1, Job 49 had been completed at a cost of $91,800 and was part of finished goods inventory. There was a $15,300 balance in the Raw Materials Inventory account. During the month of January. Swifty Company began production on Jobs 51 and 52, and completed Jobs 50 and 51 Jobs 49 and 50 were sold during the month. The following additional events occurred during the month. 1. Purchased additional raw materials of $91,800 on account. 2. Incurred factory labor costs of $71,400. 3. Incurred manufacturing overhead costs as follows; indirect materials $17,340; indirect labor $20,400; depreciation expense on equipment $12,240; and various other manufacturing overhead costs on account $16,320. 4. Assigned direct materials and direct labor to jobs as follows. Calculate the predetermined overhead rate for 2027, assuming Swifty Company estimates total manufacturing overhead costs of $856,800, direct labor costs of $714,000, and direct labor hours of 20,400 for the year. (Round answer to the nearest whole percent. eg. 25\%) Predetermined overhead rate %