So now I know that in order to workout the " Net Present Value " I have to find the " Present Value " of each year..

And for that I need to find the revenue of each year .. 

However, when there are some costs like what we have here ( marketing/production costs) should these become subtracted from the revenue for it to resemble the future value or not ?

[![Spreadsheet showing expens and sales numbers for five years][1]][1]

  [1]: https://i.sstatic.net/3x6Hk.png