They are the results of multiplying the cash flow by the relevant discount factor for 7% for 1, 2 and 3 years
flow discount factor @ 7% present value year 1 16,000 . 9346 14,954 year 2 16,000 . 8734 13,974 year 3 416,000 . 8163 339,580 368,508
If your question is really asking “How do we discount future cash flows to present value?” then I suggest that you watch John Moffat’s F2 lectures on present values and discounted cash flows