Show all computations Raful Company used a predetermined overhead rate based on an estimate of 40,000 direct labor hours to be worked during the year and an estimated $160,000 of manufacturing overhead. Actual overhead cost and activity during the year were: Actual manufacturing overhead cost incurred Actual direct labor hours worked $180,00044,000 a. Compute the predetermined OH rate. b. Compute the OH applied. c. Compute the under or over applied OH. d. Prepare the journal entry to close OH to COGS