Golden Corporation uses direct labor-hours in its predetermined overhead rate. At the beginning of the year, the estimated direct labor-hours were 21,800 hours. At the end of the year, actual direct labor-hours for the year were 20,600 hours, the actual manufacturing overhead for the year was $515,980, and manufacturing overhead for the year was underapplied by $23,640. The estimated manufacturing overhead at the beginning of the year used to calculate the predetermined overhead rate must have been: