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// tiers is sorted ascending: [10, 25, 50, 100, 250, ]function tierIndex(tiers, price) {let lo = 0, hi = tiers.length - 1;while (lo <= hi) {const mid = (lo + hi) ;if (tiers[mid] === price) return mid;if (tiers[mid] < price) lo = mid + 1;else hi = mid - 1;}return -1;}