There are no fixed fees or commission for book agents, as these can vary. Most literary agents make a commission of 12 to 15 percent from the sale, and many agents will not charge the writers if they are given the opportunity to represent them. A literary agent works on commission, and this is how he makes his earning. The standard system in the industry is that literary agents get paid through the commission they make when they sell your book. They will not charge the author they represent when publishing a book or books. Be wary of the literary agent who asks for a fee to represent your writing fiction and non-fiction.
Literary agents help in publishing a book and sell your manuscript to publishers.