Perpetual inventory using FIFO. Beginning inventory, purchases, and sales data for DVD players are as follows: Nov. 1 Inventory 10 Sale 15 Purchase 140 units at $29 110 units 150 units at $30 20 Sale 24 Sale 30 Purchase 120 units 35 units 140 units at $34. The business maintains a perpetual inventory system, costing by the first-in, first-out method. a. Determine the cost of goods sold for each sale and the inventory balance after each sale, presenting the data in the form illustrated in Exhibit 3. Under FIFO, if units are in inventory at two different costs, enter the units with the LOWER unit cost first in the Cost of Goods Fold Unit Cost column and in the Inventory Unit Cost column. First-in, First-out Method DVD Players Cost of Cost of Date Nov. 1 Quantity Purchases Purchases Quantity Goods Sold Goods Sold Inventory Inventory Inventory Purchased Unit Cost Total Cost Sold Unit Cost Total Cost Quantity Unit Cost Total Cost Nov. 10 Nov. 15