Landen Corporation uses a job-order costing system. At the beginning of the year, the company made the following estimates: During the year, Job 550 was started and completed. The following information is available with respect to this job: Required: 1. Assume that Landen has historically used a plantwide predetermined overhead rate with direct laborhours 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 total manufacturing cost, what selling price would it establish for Job 550 ? 2. Assume that Landen's controller believes that machinehours is a better allocation base than direct laborthours. 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 pereentage of 200% of its total manufacturing cost, what selling price would it establish for Job 550