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Average Cost vs. Cost Explained

Understand the difference between Average Cost and Cost (Item/Package) for parts in Blackpurl, and how each value is calculated and updated.

Blackpurl tracks two distinct cost figures for parts: Average Cost and Cost (which appears as Cost (Item) or Cost (Package)). Understanding the difference helps you interpret part pricing accurately. All cost values in Blackpurl are shown excluding taxes.
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Average Cost

Average Cost represents the average per-item cost of the in-stock inventory for a part. Because stock may have been received at different costs over time, Blackpurl calculates the average across all units currently on hand.
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For example, if your dealership receives the same part twice at different costs:

  • First receipt: $10.00

  • Second receipt: $11.00

You now have 2 units on hand. The Average Cost is $10.50, calculated as ($10 + $11) ÷ 2.
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Cost (Item) and Cost (Package)

Cost (Item) and Cost (Package) represent the last known cost of a part. This is the cost Blackpurl uses when populating a part on a Vendor Order (VO).
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This value is only updated in three ways:

  • Price file import — the cost is updated to match what the price file import specifies

  • Vendor receiving / Vendor Invoice — the cost is updated when the Vendor Invoice cost is finalised

  • Manual update — a user manually changes the cost value directly on the part

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