Payments under this subchapter, pursuant to a grant or contract, may be made (after necessary adjustment, in the case of grants, on account of previously made overpayments or underpayments) in advance or by way of reimbursement, in such installments and on such conditions as the Administrator may determine.
Except as provided in the second sentence of section 11132(c) of this title, financial assistance extended under this subchapter shall be 100 per centum of the approved costs of the program or activity involved.