The following information was available from the inventory records of Rich Company for January: Units Unit Cost Balance at January 1 3,000 $9.77 Total Cost $29,310 Purchases January 6 2,000 10.30 20,600 January 26 2,700 10.71 28,917 Sales: January 7 January 31 (2,500) (3,700) Balance at January 31 1,500 a) Assuming that Rich maintains periodic inventory records, what should be the inventory at January 31, using the FIFO. LIFO and Average Cost inventory method, rounded to the nearest dollar? b) Assuming that Rich maintains perpetual inventory records, what should be the inventory at January 31, using the FIFO, LIFO and Average Cost inventory method, rounded to the nearest dollar?