FA-84834 / Betting odds conversion / Member archive

Commission deducted from the whole price · case 04

Effective prices are reduced by commission on the stake as well as winnings.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Laying a selection at price L (> 1, else "invalid") is equivalent to backing "not this selection" at L / (L - 1). After exchange commission c percent on winnings, the effective price is 1 + (equivalent - 1) * (100 - c) / 100. Return both, rounded half up to three decimals.

Why this case matters

Matched-betting and trading calculators compare lay prices with bookmaker back prices.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
control lay favourite	`["3.000", "2.850"]`	`["3.000", "2.900"]`	Failed

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