Brabo Corporation uses direct labor-hours in its predetermined overhead rate. At the beginning of the year, the estimated direct labor-hours were 15,700 hours. At the end of the year, actual direct labor-hours for the year were 16,700 hours, the actual manufacturing overhead for the year was $352,960, and manufacturing overhead for the year was overapplied by $27,800. The estimated manufacturing overhead at the beginning of the year used in the predetermined overhead rate must?