​First: for year 0, I do not know why the cash flow = $- 1000 / ( 1 + 0.10)^0 = 909.01$

Second: for year 1, if cash flow = $30,000-5000/(1+0.10)^1 = 25 454 $

How is "Cash Flow" column useful in getting the "Present Value" column? 

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  [1]: https://i.sstatic.net/Lc6Kj.png