Suppose that instead of using a plantwide overhead rate, the company had used a separate predetermined overhead rate in each department. Under these conditions: a. Compute the rate for each department for the current year. b. Determine the amount of manufacturing overhead cost that would have been applied to the Koopers job. At the end of the year, the company assembled the following actual cost data relating to all jobs worked on during the year. a. Compute the underapplied or overapplied overhead for the year, assuming that a plantwide overhead rate is used. b. Compute the underapplied or overapplied overhead for the year, assuming that departmental overhead rates are used. a. Compute the underapplied or overapplied overhead for the year, assuming that a plantwide overhead rate is used. b. Compute the underapplied or overapplied overhead for the year, assuming that departmental overhead rates are used