The following lots of a particular commodity were available for sale during the year: 
The firm uses the periodic system and there are 20 units of the commodity on hand at the end of the year. What is the amount of inventory at the end of the year according to the average cost method?
Definitions:
[H+]
Denotes the concentration of hydrogen ions in a solution, commonly associated with the acidity of a solution.
[H+]
Symbol denoting the concentration of hydrogen ions in a solution, indicative of its acidity.
HCl
Hydrochloric acid, a strong acid consisting of hydrogen and chlorine that is often used in industrial and laboratory settings.
K
The chemical symbol for potassium, a soft, silvery-white metal that is highly reactive with water.
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