Bill Split Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t5-121

Effect

Computation or source lookup only

Input and validation requirements

The calculator has an undefined-result trap when n_people is zero and should reject that input. Its percentage fields also have a convention ambiguity: interpreting 10 as 10% gives 115 per person in the probe, while interpreting it as a raw multiplier gives 1600 per person.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "mode": "even",
    "total": 96,
    "n_people": 4
  },
  "expected_outputs": {
    "amount_owed_per_person": {
      "person_1": 24,
      "person_2": 24,
      "person_3": 24,
      "person_4": 24
    }
  },
  "working": "96.00 / 4 = 24.00. Each person owes 24.00."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche5/tranche5-results.json