pls explain how to find average cost and inventory

Swifty-Mart Centre Inc. opened for business on May 1, and uses a perpetual inventory system. During May, the company had the following purchases and sales for one of its products: Determine the cost of goods sold and cost of ending inventory using (1) FIFO and (2) average cost. (Round Average answers to 2 decimal ploces, es. 5.75.) Swifty-Mart Centre Inc. opened for business on May 1, and uses a perpetual inventory system. During May, the company had the following purchases and sales for one of its products: Determine the cost of goods sold and cost of ending inventory using (1) FIFO and (2) average cost. (Round Average answers to 2 decimal ploces, es. 5.75.)