The following information has been gathered for the Harrell Manufacturing Company for its fiscal year ending December 31: Actual manufacturing overhead costs $212,500 Actual direct labor hours 54,900 Actual direct labor costs $445,000 Estimated manufacturing overhead costs $210,000 Estimated direct labor Estimated direct labor hours $434,000 56,000 What is the predetermined manufacturing overhead rate, assuming direct labor cost is used as the activity base?