If you wish to delete your blogger blog permanently,there is an option in blogger to do so.Even if you delete your 
blog ,blogger gives you a chance to restore it within 90 days if you wish to.You can create another 
blog at this address using the Google Account you're currently logged in with."
3 Easy Steps you need to follow:- Go to your blogger Dashboard and Click on settings
 
- Under the Basic tab you will find an option "Delete Blog" click on it
 
- Once you do it blogger will ask your permission whether you really want to delete.
 
- Click on Delete This Blog. 
 
This was an easy tutorial on how to delete your 
blog.Most of the bloggers know about it but i hope there are many refreshes who will be benefited.Feel free to post in your comments and let us know  why you delete your blog? your reason as a comment below