The units of an item available for sale during the year were as follows: 
There are 19 units of the item in the physical inventory at December 31. The periodic inventory system is used. Determine the ending inventory cost using LIFO.
Definitions:
Mental Grouping
The cognitive process of categorizing objects or information based on shared attributes or relations, aiding in understanding and memory.
Prototype
An original model or first form from which other forms are copied or developed.
Category
A class or division within a system of classification in which members share certain characteristics or attributes.
Prototype
A preliminary model or early sample of a product that serves as an example or basis for designing subsequent forms or versions.
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