Beginning inventory, purchases, and sales data for prepaid cell phones for May are as follows: Inventory Purchases Sales May 1 1,550 units at $44 May 10 720 units at $45 May 12 1,200 units 20 1,200 units at $48 14 830 units 31 1,000 units a. Assuming that the perpetual inventory system is used, costing by the LIFO method, determine the cost of merchandise sold for each sale and the inventory balance after each sale, presenting the data in the form illustrated in Exhibit 4. Under LIFO, if units are in inventory at two different costs, enter the units with the HIGHER unit cost first in the Cost of Merchandise Sold Unit Cost column and LOWER unit cost first in the Inventory Unit Cost column. Schedule of Cost of Merchandise Sold LIFO Method Prepaid Cell Phones Cost of Cost of Merchandise Merchandise Sold Sold Unit Cost Total Cost Purchases mit Purchases Quantity Quantity Inventory Inventory Inve