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Stripe · Coding
Currency Exchange Rate Converter
Must priorityMedium
The questionBuild a currency exchange system for a global payments platform with rate lookups and conversions
Executable browser contract: Implement tiered_cost(units, tiers). tiers is an ordered list of (inclusive_upper_bound, price_per_unit), with the final bound optionally None. Prices apply incrementally. Return a float and reject negative units, non-increasing bounds, or insufficient tiers.
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