P6-5A You are provided with the following information for Najera Inc. for the month ended June 30, 2017. Najera uses the periodic method for inventory Unit Cost or Quantity Selling Price Date June 1 June 4 Purchase June 10 Sale June 11Sale return June 18 Purchase June 18 Purchase return June 25 Sale June 28 Purchase Description $40 40 135 110 15 eginning invento 70 70 46 46 75 50 10 65 30 Instructions (a) Calculate (i) ending inventory, (ii) cost of goods sold, (ii) gross profit, and (iv) gross profit rate under each of the following methods. (1) LIFO. (2) FIFO. (3) Average-cost. (b) Compare results for the three cost flow assumptions