You are performing an analysis on the overall NPV of a project with the option to abandon. The project costs $4,000 to set up and generates an annual cash flow of $1,000 for the next 20 years. After 3 years, the estimate of remaining annual cash flows will be revised either upward to $1,500 or downward to $400. The upward revision is expected to happen with probability of 40% and the downward revision is expected to happen with probability of 60%. At that time, this project can be sold for $5,000. Calculate the revised NPV given that the firm have the option to abandon the project after 3 years. Assume that the discount rate is 12% and cash flows occur at year-end.