If i make URL of keywords i find none of them attractive.....url not related to keywords not good If we use URL made of keywords how much percentage will it help in my seo.
Well you can have a url with no keyword and still rank high but in mind opinion having keyword in the url helps get natural backlink with keyword. For example, if your domain is keywordcentral.com, you will naturally get people using "Keyword Central" to link back to you.
It seems to have taken on a smaller role recently. We used to create blogs for clients and they would get picked up in the matter of a couple of weeks for pretty competitive terms contained in the URL. In the last couple of month, I've noticed that it doesn't work as well anymore...
My experience, It's great to use keywords in url, In my guidetoearnmoney.com site, i find many pages being ranking in google just for keywords in url and title. IT is very important aspect of SEO.