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Page Rank Calculation
18 medium with 50 oubounds PRx = 1 PRx
3.559 medium PRx with 50 outbouns PRx = 1 PR(x-1)
0.607 medium PRx with 50 outbouns PRx = 1 PR(x-2)
101 medium PRx with 50 outbouns PRx = 1 PR(x+1)
555 medium PRx with 50 outbouns PRx = 1 PR(x+2)

If you want to revalue the total outbounds link you divide 50 by the links.

50/TOL = links (TOL = Total Outbound Links [external only])

So if you have a link that has 25 TOL it is the same as 2 that have 50.
If you have a link that has 100 TOL it is the same as 0.5 that has 50.

In general inbounds to most sites come to the home page and most smaller sites have a fully meshed link structure.  With these types of sites you can get an idea of the PR value of the home page by looking at the subs.  When you channel PR and/or have a good number of your inbounds coming to a sub pages you will not be able to tell with as much certainty the strength of the home page PR by looking at the subs.

Home PRx and subs PRx: strong PRx on the home.
Home PRx and subs PR(x-1): medium PRx home page.
Home PRx and subs PR(x-2): weak PRx home page.

You many want to read my article Page Rank Calculation where I cover the above rules.  Also you will want to read Wafkers Google PageRank, & How to Get It and look at his chart from which I have based my figures.