Expected overhead cost and related data for the two production departments follow. Direct labor hours Machine hours Overhead cost Fabricating 180,000 DLH Assembly 310,000 DLH 165,000 MH $370,000 132,000 MH $445,000 Required 1. Determine the plantwide overhead rate for Laval using direct labor hours as a base. 2. Determine the total manufacturing cost per unit for the aluminum desk lamp using the plantwide overhead rate. 3. Compute departmental overhead rates based on machine hours in the fabricating department and direct labor hours in the assembly department. 4. Use departmental overhead rates from requirement 3 to determine the total manufacturing cost per unit for the aluminum desa lamps.