Costs of doing business are not passed on to the clients, or rather they shouldn't be. Things like training, coding books, accountants, lawyers, etc. The only "costs" to a client should be the costs associated specifically to the client such as claim forms, envelopes, printer ink, phone, fax, etc. You only want to add in the costs of those things the client utilizes, your "costs of doing business" are other items that the client would not need to pay for at all as a benefit to outsourcing.