A firm currently produces and sells 2,500 units every 60 days. One unit costs $150 to produce and sells for $500. The firm currently offers all its customers a "net 30" credit period and all customers pay on Day 60. In order to boost sales, the firm is considering Project D, which will simply add a window and offering a 10% discount for customers who pay immediately. Research suggests sales will increase sales to 2,600 units and approximately one-quarter of all customers will pay on Day 0 and 75% will pay on Day 30. If the annualized cost of capital is 6%, what is the NPV of Project D? The firm will continue to run to perpetuity. (Assume production and sales occur on Day 0 and repeat every 30 days).