I just registered this morning and the more I try out the shopping cart the more I like it. However, in Pennsylvania the sales tax applies to the TOTAL of BOTH the item AND the shipping (6%). So far, I have been able only to have the tax calculated on the item (including multiples). How do I configure the sales tax for Pennsylvania? I think this is the last detail I need before I can implement the cart live (after I sign up). I am excited about how smoothly everything has gone so far.