please help!

Irrather Corporation uses a job-order costing system with a single plantwide predetermins overhead rate based on direct labor-hours. The company based its predetermined overhead re for the current year on the following data: Total direct labor-hours 50,000 Total fixed manufacturing overhead cost $ 285,000 Variable manufacturing overhead per direct labor-hour 3.80 Recently, Job P513 was completed with the following characteristics: Number of units in the job Total direct labor-hours Direct materials Direct labor cost 10 20 $ 710 $ 500 Required: a. What is the plantwide predetermined overhead rate for fixed manufacturing costs per direct-labor hour? b. What is the total plantwide predetermined overhead rate per direct-labor hour? c. What is the overhead allocated to Job P513? d. What is the total manufacturing cost of Job P513? If actual total direct labor-hours are 40,000 will applied overhead be over or under applied