{"id":"week-k-total-is-28-plus-7k","text":"Each 0-indexed complete week `k` contributes exactly `28 + 7k` to the total; the formula sums this series as `28W + 7·W(W-1)/2` where `W` is the number of complete weeks.","truth_value":"IN","source":"entries/2026/06/06/calculate-money-in-leetcode-bank-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"week-k-total-is-28-plus-7k","truth_value":"IN","reason":"premise"}]}}