Single Plantwide and Multiple Production Department Factory Overhead Rate Methods and Product Cost Distortion The management of Nova Industries Inc. manufactures gasoline and diesel engines through two production departments, Fabrication and Assembly accurate product cost information in order to guide product strategy. Presently, the company uses a single plantwide factory overhead rate for allocating factory overhead to Noya. a. Determine the per-unit factory overhead allocated to the gasoline and diesel engines under the single plantwide factory overhead rate method, using direct labor hours as the activity base