Bramble Back Falls Ltd. uses the perpetual inventory system. Calculate Bramble Back's cost of goods sold, gross margin, and ending inventory for the month of February using FIFO. Cost of goods sold $ Gross margin $ Ending inventory $ Bramble Back Falls Ltd. uses the perpetual inventory system. Calculate Bramble Back's cost of goods sold, gross margin, and ending inventory for the month of February using FIFO. Cost of goods sold $ Gross margin $ Ending inventory $