Problem #2 (30 Points) Calculate the gross profit and ending inventory using a) FIFO, b) LIFO, c) weighted-average cost methods under a perpetual inventory cost flow method. The company sold 3 units for $75 each on September 29 COST $16 20 24 28 $88 UNITS DATE Sept. 6 Purchase 9 Purchase 11 Purchase 17 Purchase 1 Total