You are provided with the following information for Najera Inc. for the month ended June 30, 2014. Najera uses the periodic method for inventory. Calculate cost per unit. Calculate ending inventory, cost of goods sold, gross profit under each of the following methods. (1) LIFO. (2) FIFO. (3) Average-cost. Calculate gross profit rate under each of the following methods. (1) LIFO. (2) FIFO. (3) Average-cost