Taxes R Us (TRU), an income tax preparation firm, uses the FIFO method of process costing for the monthly reports. TRU has no materials cost in the preparation of the returns. The fol- lowing shows its March information: Required Required Required Returns in process, March 1 (30% complete) Returns started in March Returns in process, March 31 (90% complete) Labor and overhead costs for returns in process, March 1 Labor and overhead costs incurred in March 100 1,600 200 $ 2,500 $173,250 Calculate the following amounts for conversion costs using the FIFO method: 1. Equivalentunits. 2. Cost per equivalent unit. 3. Cost of completed returns for the month of March. 4. Cost of returns in process as of March 31.