Single Plantwide Method 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 agtivity base . If required, n answers to the nearest cent. Gasoline engine $ per unit Diesel engine $ per unit Multiple Production Department Method b. Determine the per-unit factory overhead allocated to the gasoline and diesel engines under the multiple production department factory overhead rate method, using direct labor hours as the activity base perunit answers to the nearest cent. Gasoline engine $ per unit Diesel engine $ per unit