Authors buying books from publishers

I've published a book at my own expense, giving the author 10% of the cover price (79.9p from a £7.99 book) for every book sold.

My question is, the author wants to buy copies from me, how much should I charge him?

Helena

I see. In my case I give some shops 30%, others 35% and the wholesaler get 50%. What should the author get?

How would they know if you were re-selling, unless you tell them?

My author only buys a handful at a time, and I used to charge him just the cost of printing, but I am a bit disappointed that he gives them away to people he meets, people who might have bought the book, so he is losing me sales.

I'm going to give him 35%.

Thanks everyone