Google page rank calculation formula

Google Page Rank will not help us to promote our site in Google search engine. It is just numerical ranking value between (0 to 10 ) which is provided by Google to show the quatity of websitse. Google Page rank calculation formula is basically calculated only using external links like inbound and outbound links which is shown below. While increasing the inbound links our page rank also slightly increase.
Google Page Rank Formula:
PR(A) = (1 - d) + d * SUM ((PR(I->A)/C(I))
Where:
PR(A) is the PageRank of your page A.
d is the damping factor, usually set to 0,85.
PR(I->A) is the PageRank of page I containing a link to page A.
C(I) is the number of links off page I.
PR(I->A)/C(I) is a PR-value page A receives from page I.
SUM (PR(I->A)/C(I)) is the sum of all PR-values page A receives from pages with links to page A..


There is so many websites in the reached top position in search engine which having low google page rank .So google page rank is not so much important for promoting our websites in google search engine itself. But it is calculated based on traffic also.

Already we discussed above google page rank formula is based on inbound and outbound links. So it is indirectly makes traffic in Search Engines.