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A quality-and-cost-based selection scores price relative to the lowest bid and combines it with the technical score at agreed weights — commonly 70:30. That structure lets a technically superior bid win despite a higher price, provided the margin is justified.
Price score
Price score = Lowest price / Bid price x 100
Combined score
Combined = Technical score x 70% + Price score x 30%
Because it produces a bounded 0-100 scale that behaves sensibly regardless of the absolute price level or currency.
70:30 technical to price for complex services, 40:60 or lower for commodities where technical differentiation is minimal.