(14 points) The following information April: pertains to Yap Company's Grinding Department for the month of Materials Costs S5,650 Beginning work in process Started in April Units completed and transferred out Ending work in process Units 15,000 40,000 42,500 12,500 $18,000 100% of materials are added at the beginning of the process. REQUIRED (1) U sing the weighted-average method, calculate the equivalent units of production f materials. Using the weighted-average method, calculate the cost per equivalent unit for mat