"The short answer is that our fee is approximately 10% of the price you set for your book (list price). That means most of our stores take about 30%, Draft2Digital takes about 10%, and you keep about 60% of the list price of your ebook.

For print books, you will make about 45% of the list price of your print book, minus the base printing cost."

Then if Paypal or whomever processes the payment takes a cut...

https://www.draft2digital.com/faq/#how-much-does-draft2digital-cost