Most subscription services have agreed to pay publishers each time a reader gets a certain way into a book—typically around 10%—and the fees are about the same as if they had sold it as a one-off download.

In this sentence, "typically around 10%"refers fees or book pages?

Question

Most subscription services have agreed to pay publishers each time a reader gets a certain way into a book—typically around 10%—and the fees are about the same as if they had sold it as a one-off download.

In this sentence, "typically around 10%"refers fees or book pages?

Answer

10% is referring to the pages. If the reader reads 10% or more of the book, the publisher gets paid.