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 125,000 Machine-hours required to support estimated production 62,500 Fixed manufacturing overhead cost $ 350,000 Variable manufacturing overhead cost per direct labor-hour $ 3.80 Variable manufacturing overhead cost per machine-hour $ 7.60 During the year, Job 550 was started and completed. The following information is available with respect to this job: Direct materials $ 201 Direct labor cost $ 240 Direct labor-hours 15 Machine-hours 5 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.c. If Landen uses a markup percentage of 200% of its to