FA-85348 / Ride-hailing fare and surge pricing / Member archive

Distance charge truncated to the cent · case 03

Distance charges ending in half a cent or more lose a cent.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

All money is integer cents. Distance charge = meters x per_km / 1000 and time charge = seconds x per_min / 60, each rounded half up to a cent on its own. Subtotal = base + distance + time. The minimum fare applies to that subtotal only; the booking fee is added after the minimum. Return the distance charge, time charge and fare.

Why this case matters

Ride-hailing prices are computed per trip at scale; ordering, unit and boundary slips become systematic over- or under-charging.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: distance cent rounding	`{"distance": 312, "fare": 675, "time": 18}`	`{"distance": 313, "fare": 675, "time": 18}`	Failed

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