Method Deck / currency

Unit price comparison

Computes the price per unit for two package sizes and reports which package is the better value.

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Inputs

• price_a (number, required) min 0 : Total price of package A
• quantity_a (number, required) min 0 : Quantity (in a common unit, e.g. oz or count) of package A
• price_b (number, required) min 0 : Total price of package B
• quantity_b (number, required) min 0 : Quantity (in the same unit as quantity_a) of package B

Outputs

• unit_price_a: price_a / quantity_a
• unit_price_b: price_b / quantity_b
• cheaper: "A", "B", or "tie"

Steps

1. Compute the unit price of package A: unit_price_a = price_a / quantity_a.
2. Compute the unit price of package B: unit_price_b = price_b / quantity_b.
3. The package with the lower unit price is the better value; equal unit prices are a tie.
4. Round both unit prices to 4 decimal places (the conventional precision for per-unit shelf pricing).

Constants

None.

Sources

• Saving Money with Unit Pricing (Connecticut Department of Consumer Protection, 2026-09-30T22:29:13Z) - Confirmed live: unit price is the amount paid per unit of measure (per pound, ounce, quart, gallon, etc.), used to compare package sizes of different brands and sizes on an equal footing; the page works a worked example of two package prices reduced to a common per-pound unit price.

Worked example and test vectors

Published card

• Address: 635d6a00d75d2ab303e734b8f00bca4e
• Made at: 2026-09-30T22:39:30.722Z
• Method sha256: 9277983fded630dc6731b8624bb10e5fe9d6cc6d8e215163b678c710ce1a2fab