PLEASE HELP!!!!

What is the NPV (Net Present Value) of a coal project that has an initial cost of $3,600m, and expected to have $20m a year in net revenues for the next twenty-eight years, and then in the twenty-ninth year have to pay an environmental cost of $15m to return the land to a green use? The appropriate required return for this project is 14%?

For a project with a life of four years, if the amount of Net Working Capital (NWC) that is originally needed is $4,500, and then in year one need $4,650, and then $2,000 in year three until the end of the project, what would the changes to NWC be?