I need a step by step explanation. I am completely lost.

which uses a job-costing system, began business on January 1, 20x3 and applies manufacturing overbead on the 3. Rock Star, Inc, Budgeted direct labor and manufacturing overhead were anticipated to be $200,000 and Job nos. 1, 2, and 3 were begun during the year and had the following charges basis of direct-labor cost. The following information relates to 20x3: $250,000, respectively. for direct material and direct labor 90,000 XbO.00 $145,000 320,000 55,000 535,000 65,000 80,000000 IWP Job nos l and 2 were completed and sold on account to customers at a profit of60% of st Job no. 3mmained in Actual manufacturing overhead by year-end totaled $233,000. Rock Star adjusts all under- and overapplied overhcad to cost of goods sold. Required: A. Compute the company's predetermined overhead application rate B. Compute Rock Star's ending work-in-process inventory C. Determine Rock Star's sales revenue D. Was manufacturing overhead under- or overapplied during 20x37 By how moch? E. Present the necessary journal entry to handle under- or overapplied manufacturing overhead at year-end F. Does the presence of under- or overapplied overhead at year-end indicate that Rock Star's accountants made a serious error? Briet explain