To do this, it is an extremely simple process. Once you have your Google+ page created for your business, just go into the Google+Tab and select the Google+ page you want your Blogger page associated with.
The following is an expert from the Blogger documentation:
If your blog is a brand (eg. “The Coffee Bar”), you can link your blog to a Google+ page. By creating a page for your blog you’ll find that linking your blog to your Google+ page may increase its discoverability and make it easier to form communities with other bloggers and readers.
When you link your blog to your Google+ page, you can share posts directly from Blogger to your page. If you associate your blog with a Google+ page, any Blogger gadgets that originally pointed to your Google+ profile will then point to your Google+ page. The same is true if you switch from a page to a profile.
If your blog is currently associated with a page, and you would like to link it to your Google+ profile or another page you own, you can do so via the Google+ tab on Blogger.