The following information relates to Carla Vista Ltd.'s inventory transactions during the month of October. All of the units sold on October 5 were priced at $25 per unit. All of the units sold on October 15 and 31 were priced at $35 per unit. (a1) Carla Vista Ltd. uses the perpetual inventory system. Calculate Carla Vista' cost of goods sold, gross margin, and ending inventory for the month of October using FIFO. Cost of goods sold $ Gross margin $ Ending inventory $