The following three identical units of Item Beta are purchased during June: Average cost per unit Assume that one unit is sold on June 27 for $110. Determine the gross profit for June and ending inventory on June 30 using the (a) first-in, first-out (FIFO); (b) last-in, first-out (LIFO); and (c) weighted average cost methods. a. First-in, first-out (FIFO) b. Last-in, first-out (LIFO) c. Weighted average cost