I'm having the SAME problems with this book. I've tried emailing AND calling customer services and no-one seems to know who has these additional solutions? Surely by purchasing a copy of the book, I, as the consumer, have the right to know the answers to questions that are set in the textbook? Failing to provide these answers renders 50% of the book as useless! Its just not worth the hassle, or the money or the time it takes to try and resolve the issue.
I recommend Business Accounts (4th ED) osborne books, ISBN 978-1-905777-92-1. (they also have customer helpline, email and web printed on the back cover of the book, so its easy to find)
I downloaded the additional solutions within 10 minutes of logging on the their website