Metlock Hands Ltd. is a retailer specializing in hand care products. The company donates twenty percent of its profits to local charities. Metlock Hands uses the periodic inventory system and the following limited information relates to Metlock Hands Ltd. 's inventory transactions during the month of May: Units sold were priced at $57.00. (a) Calculate Metlock Hands' cost of goods sold, gross margin, and ending inventory for the month of May using FIFO