Which metric is specifically used by mathematics learning subscription services to measure the average revenue generated per user before they cancel their subscription?

The world of mathematics education has been revolutionized by digital subscription services that deliver practice problems, interactive tutorials, and personalized learning experiences. Behind these successful platforms lies careful analysis of customer metrics and retention strategies. Test your knowledge about how mathematics education subscription services measure and optimize their business models!

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Customer Lifetime Value (CLV)
Monthly Recurring Revenue (MRR)
Net Promoter Score (NPS)
Problem Completion Rate (PCR)