Larsen Company adds materials at the beginning of the process in Department 2. Data concerning the materials used in May production are as follows: Units Work-in-process at May 1 12,000 Started during May 32,000 Completed and transferred out during May 33,000 Normal spoilage incurred 3,000 Work-in-process at May 31 8,000 Using the weighted-average method, the equivalent units for materials are: