In chronological order, the inventory, purchases, and sales of a single product for recent month are as follows Amount per unit June 1 Beginning Inventory 150 4 Purchase 12 Purchase 16 Sales 24 Purchase 1,300 80(Selling price) Required Using the permetual inventory system compute the cost of ending inventory, cost of goods sold, and gross margin Use the average-cost method FIFO inventory costing method LIFO inventory costing method 1 mark 2 marks 2 marks Round unit costs to cents and total to dollars