RE: /tigerseaI do not pick USD 60 etcetera but the other analysis did.
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In MY own analyses I use different averages for different time periods of 10 years assuming the uranium price will differ USD 50 between 2009 and 2019, and between 2010 and 2020 etc, thus resulting in somewhat different averages (USD 90, 85, 80, 75) for periods starting with year 2009, 2010, 2011, 2012 which are the different "base years" for my own (p/e)calculations.
It is not an exact method but better than just assuming ONE price.