hi so I am stuck in these questions. I do have the solutions for the questions but I do not know how to calculate each section For example, Under T=1 How did they get the 500,000 = Sales, or Costs = (305,000) and so on. can someone please explain to me just the steps on how to get these numbers under box t =1 and for each Section from "Sales to OCF "Operating Cash Flows".

Also in the second picture how did they get the Payback period, the Discounted payback period, the NPV. If u can show me step by step how they get the numbers.

Thanks and stay safe.