SaaS and Fintech Business Models Assessment

A SaaS enterprise starts the fiscal year with a Monthly Recurring Revenue (MRR) of $100,000 from a cohort of 500 existing customers. Over the year, 20 customers churn completely (representing $5,000 in lost MRR), 40 customers downgrade their subscription packages (representing a contraction of $3,000 in MRR), and 100 customers expand their subscriptions by adding user licenses or modules (representing an expansion of $12,000 in MRR). The company also acquires 50 new customers, contributing $8,000 in brand-new MRR. What is the company's Net Dollar Retention (NDR) for the year?