At the beginning of the year, Green Co. estimated the following: Overhead $564,000 Direct labor hours 120,000 hours Green applies overhead on the basis of direct labor hours. By the end of the year, Green showed for the following actual amounts: Overhead $510,000 Direct labor hours 108,000 hours At the end of the year, what is the amount of the over- or under-applied overhead? $56,400 overapplied $54,000 underapplied $2400 underapplied $3000 overapplied