Under the new model, the publishers would set the retail prices for their books and the distributor would assess a 30 percent commission. (techtimes.com)
In the agency model, the publishers set the retail price, the distributor gets a fee (30 % or so), and that's it. (theguardian.com)
With this you can set the retail price of your book and ascertain the royalty that you would receive. (notionpress.com)