Please show calculations

4. Intercontinental Company bases its predetermined overhead rate on direct labor hours. At the beginning of the current year, the company estimated that its manufacturing overhead would total $440,000 during the year. During the year, the company incurred $400,000 in actual manufacturing overhead costs. The Manufacturing Overhead account showed that overhead was underapplied by $16,000 during the year. If the predetermined overhead rate was $40.00 per direct labor hour, how many hours were worked during the year