Adding shipping to MarketPress

Hi
I am selling books and would like to charge shipping as follows:

UK: £2.50 postage fee per order plus 50p for each additional book.
Europe: £4.85 postage fee per order plus £2.85 for each additional book.
International: £7.00 postage fee per order plus £5.00 for each additional book.

Is this possible and if so could you please give me some instructions on how to achieve it.

many thanks
Mariette