The beginning inventory at Keats Office Supplies and data on purchases and sales for a three-month period are shown in Problem 7-1A. Instructions 1. Record the inventory, purchases, and cost of merchandise sold data in a perpetual inventory record similar to the one illustrated in Exhibit 4, using the last -in, first -out method. 2. Determine the total sales, the total cost of merchandise sold, and the gross profit from sales for the period. 3. Determine the ending inventory cost