Which of the following might help determine the age of the volcanic features in this figure? 
Definitions:
Costs Per Equivalent Unit
A calculation used in process costing that distributes costs evenly across units produced, factoring in various stages of completion.
Weighted-Average Method
An inventory costing method that assigns cost to inventory on the basis of the average cost of all similar goods available during the period.
Equivalent Units of Production
A conversion of partially completed units into a number of fully completed units during a period, used in process costing systems.
Costs Per Equivalent Unit
A calculation used in process costing that determines the cost of a single completed unit, considering work done on partial units.
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