Discount rate. Future Bookstore sells books before they are published. Today, they are offering the book Adventures in Finance for $14.88, but the book will not be published for another 3 years. The retail price when the book is published will be $23. What is the discount rate Future Bookstore is offering its customers for this book? What is the discount rate Future Bookstore is offering its customers for this book? % (Round to two decimal places.)