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. From the above data, using the 9 column schedule, calculate the COGS and ending inventory based on each of the following cost formulas: (Assume that perpetual inventory records are kept. Calculate unit costs to the nearest cent and ending inventory to the nearest dollar) Weighted average cost . First-in, first-out (FIFO) . Based on your results in part (a), and assuming that the average selling price per unit during December was $8.00, prepare partial income statements up to the "gross profit on sales" line. Calculate the gross profit percentage under each inventory cost formula. Round your answers to one decimal place. Which GP is higher? a. Calculate gross profit for the month of November. b. Calculate the gross profit margin percentage for November. c. Determine the amount of inventory lost by GBC Company as a result of the fire using the gross profit method