Match purchase, washing, freezing energy and loss records to actual uses. Compare supplier offers using the same period and assumptions.
Record pack purchases, completed uses, washing cost, allocated freezer energy and losses for a defined period. Divide total cost by actual completed uses; include repair or replacement. Label estimated inputs and compare alternatives over the same period, routes and maintenance assumptions.
Fix the period and definition of a completed use. Match invoices, losses, repairs, washing and freezer-energy records to the same inventory.
Divide total ownership cost by actual completed uses. Mark assumed lifetime or energy inputs as estimates, separate from measured data.
Compare new offers using the same routes, washing method and stock-turn assumptions. Include unit cost and data uncertainty in the purchasing decision.
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