That sounds quite reasonable to me. That's about what a freelance proofreader charges to edit a book, if https://thewritelife.com/how-much-to-pay-for-a-book-edi

That sounds quite reasonable to me. That's about what a freelance proofreader charges to edit a book, if https://thewritelife.com/how-much-to-pay-for-a-book-editor/ https://thewritelife.com/how-much-to-pay-for-a-book-editor/ is correct, and that's working with a (likely Word) document which isn't poorly scanned from paper.