Blue Company's predetermined overhead rate is based on direct labor hours (DLHs). At the beginning of the current year, the company estimated that its manufacturing overhead would total $370,800 during the year. During the year, the company incurred $300,000 in actual manufacturing overhead costs. The Manufacturing Overhead account showed that overhead was over-applied by $20,000 during the year. If the predetermined overhead rate was $45.00 per DLH, how many DLHs were worked during the year?