Taxes R Us (TRU), an income tax preparation firm, uses the FIFO method of process costing for its materials cost in the preparation method of process costing for its monthly reports TRU has no of the retums. The following shows its March information: Returns in process, March 1 (303 complete) Returns started in March Returns in process, March 31 (90% complete) Labor and overhead costs for returne in process. March 300 600 600 Labor and overhead costs incurred in March $412, 500 sRequired: Calculate the following amounts for conversion costs using the FIFO method: 1 Number of equivalent units (tax returns) 2. Cost per equivalent unit 3. Cost of completed tax returns for the month of March 4 Cost of tax returns in process as of March 31