Use the following information for the three grains. 
Calculate the aggregate price index.
Definitions:
Product-Level Activity
This refers to costs and activities associated with specific products, separate from the overall operation of a company.
Batch-Level Activity
Activities and costs associated with processing a group of units or products together as a single batch.
Unit-Level Activity
Activities that vary directly with the volume of production units, such as processing, assembly, or packaging activities in manufacturing.
Activity-Based Costing
A costing methodology that assigns manufacturing costs to products based on the activities that go into producing them.
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