please help with empty boxes

Perpetual Inventory Using RIFO Beginning inventory, purchases, and sales dath for prepaid cell phenes for May are as follows: Assume that the business maintains a perpetual inventory system, costing by the first-in, first-out method, Determine the cost of merchandise sold for each sale and the invantory balance aftec eech shle, presenting the data in the form iliustrated in Exhibit 3, Under FIFO, If units are in inventory at two diffecent costa, enter the units with the LOWER unit cost first in the Cost of Merchondiae Sold Unit Cost column and in the Inventory Unit Cost column. Schedule of Cost of Merchandise Sold