available for obligation for 1 additional fiscal year: Provided further, That the total loan principal or guaranteed principal amount shall not exceed $10,000,000,000. Trade and development agency For necessary expenses to carry out the provisions of section 661 of the Foreign Assistance Act of 1961, $87,000,000, to remain available until September 30, 2025, of which no more than $21,000,000 may be used for administrative expenses: Provided, That of the funds appropriated under this heading, not more than $5,000 may be available for representation and entertainment expenses. VII GENERAL PROVISIONS ALLOWANCES AND DIFFERENTIALS 7001. Funds appropriated under title I of this Act shall be available, except as otherwise provided, for allowances and differentials as authorized by sub chapter 59 of title 5, United States Code