All costs, charges and expenses incurred by the Investors Trust in managing and administering its affairs shall form a first charge upon the income of the trust funds and estate held and administered under or by virtue of the provisions of this Order except in so far as the same may in the discretion of the Investors Trust form a proper charge against any special or separate fund, property or estate forming part of such trust funds and estate or in so far as such costs, charges and expenses shall be provided by the General Assembly.