Hello,
I'm a freelance writer with over 6 years of experience working with small businesses and entrepreneurs, including ghostwriting books. I've done work similar to what you're asking for, and even have a "Top 10"-style article in the portfolio under my profile on this site.
My rate for your project is 150 AUD, which includes the following: writing 40 hints for the ebook, as specified; procuring royalty-free and/or public domain images for the book, as needed; designing the book's front and back covers; unlimited revisions and edits. I can have the book completed within 10 days.
If you have any questions about my proposal, please feel free to ask. I look forward to working with you on this ebook.
Warmest Regards,
Rhonda Bunton