4. 1. Laval produces lamps and home lighting fixtures. Its most popular product is a brushed aluminum desk lamp. This lamp is made from components shaped in the fabricating department and assembled in the assembly department. Information related to the 33,000 desk lamps produced annually follows. Direct materials $ 280,000 Direct labor Fabricating department (8,000 DLH $34 per DLH) $ 272,000 Assembly department (16,200 DLH $21 per DLH) $ 340,200 Machine hours Fabricating department 14,200 MH Assembly department 20,450 MH Expected overhead cost and related data for the two production departments follow. Fabricating Assembly Direct labor hours 140,000 DLH 320,000 DLH Machine hours 175,000 MH 121,000 MH Overhead cost $ 410,000 $ 440,000 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 desk lamps.