Opera Corp. uses dollar-value LIFO method of computing its inventory cost. Data for the past three years is as follows: 
What is the 2015 inventory balance using dollar-value LIFO?
Definitions:
Units Per Period
A metric that indicates the quantity of production, sales, or any other measurable activity within a specified timeframe.
Marginal Product
The increase in output that results from employing one more unit of a specific input, holding all other inputs constant.
Bushels
A unit of volume that is used in the United States for measuring agricultural products, such as grains.
Marginal Product
The increase in output resulting from a one-unit increase in the amount of a single input used, holding all other inputs constant.
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