FA-84383 / Betting odds conversion / Member archive

Decimal price rounded with binary floats or truncated · case 03

A -800 line shows 1.12 instead of 1.13.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Expand an American moneyline ("+150", "150" or "-200"; magnitude at least 100, otherwise "invalid"). Profit per unit is N/100 for positive or unsigned lines and 100/N for negative lines. Return [decimal price with two decimals, reduced fractional profit "a/b", implied probability percent with one decimal], all computed exactly and rounded half up.

Why this case matters

Odds screens show American, decimal, fractional and implied-probability columns for one price.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
control half-up decimal	`["1.12", "1/8", "88.9"]`	`["1.13", "1/8", "88.9"]`	Failed

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