A manufacturing company applies factory overhead based on direct labor hours. At the beginning of the year, it estimated that factory overhead costs would be $494,590 and direct labor hours would be 49,459. Actual factory overhead costs incurred were $519,686, and actual direct labor hours were 54,134. What is the amount of overapplied or underapplied manufacturing overhead at the end of the year? a. $21,654 overapplied b. $541,340 overapplied c. $46,750 underapplied d. $21,654 underapplied acer