Beginning inventory, purchases, and sales data for cell phones for July are as follows:

Inventory

 

Purchases

 

Sales

 

July 1

100 units at $30

July

3

80 units at $32

July 7

72 units

 

 

 

21

60 units at $33

13

80 units

 

 

 

 

 

31

32 units

                   

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.