Estimated total fixed manufacturing overhead Estimated variable manufacturing overhead per direct labor-hour $13,000 $ 1.00 Estimated total direct labor hours to be worked Total actual manufacturing overhead costs incurred Direct materials Direct labor cost Actual direct labor hours worked Job Y Job Z $13,000 $ 8,000 $ 21,000 $7,500 1,400 ? 2,000 $ 12,800 Assuming Job Z's total job cost is $19,250, how many direct labor hours were actually worked on Job Z? 600 O 575 500 525