Hi sara, welcome to the forum.
Here's my $1500 lecture. Abbreviated form.
PR is a plaything from the devious minds of twisted Google engineers. At least the PR that we can see is.
The real page rank that determines where our pages will be displayed in the serp is invisible.
Unless you are trying to up the asking price for a domain (as the boss asked above), you are wasting brain power. Concentrate on getting backlinks and visitors.
The more visitors, the more backlinks. The more backlinks the more visitors.
(I'd show you the math equation but my keyboard doesn't have enough keys.)
