The Ismā'īlīs donate 10% to 12.5% of their monthly net income (after taxes, basic living necessities and debt repayment) to the Imām – an amount which includes zakat and khums, which goes to the central accounts and then spent on the welfare of humankind including: Aga Khan University, Aga Khan Health Services and the Aga Khan Museum. These institutions are run by the Aga Khan Development Network, which is one of the biggest welfare networks in the world. The Ismaili organization is spread over 25 countries and has a network of financial, business and development institutions that between them spend more than EUR550 million on social and cultural activities alone.[2] Thus, Ismā'īlīs believe that as Muhammad was designated to take zakāt from the believers in the past, it is now the duty to pay the imām or his representative.