Landen Corporation uses a job-order costing system. At the beginning of the year, the company made the following estimates Direct labor-hours required to support estimated production Machine-hours required to support estimated productiorn Fixed nanufacturing overhead cost variable manufacturing overhead cost per direct labor-hour Variable manufacturing overhead cost per machine-hour 155,000 77,500 $465,000 $ 4.80 $ 9.60 points eBook ntDuring the year, Job 550 was started and completed. The following informatiqn is available with respect to this job: Print Direct materials Direct labor cost Direct Labor-hours Machine-hours s 210 $ 349 15 Required: 1. Assume that Landen has historically used a plantwide predetermined overhead rate with direct labor-hours as the allocation base. Under this approach: a. Compute the plantwide predetermined overhead rate. b. Compute the total manufacturing cost of Job 550