an explanation on how to solve for the chart. more specifically an explanation on how to get the value under quantity sold where mouse is pointed at please.

a. Assuming that the perpetual inventory system is used, costing by the LFO method, 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 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 Goods Sold Unit Cost column and LOWER unit cost first in the Inventory Unit Cost column. b. Based upon the preceding data, would you expect the inventory to be higher or lower using the first-in, first-out method