Loan agreements between the United States and tribes, corporations, partnerships, cooperative associations and individual Indians for financing economic enterprises, and to relending organizations, will require that borrowers establish and maintain accounting and operating records that are satisfactory to the Commissioner and submit written reports as required by the Commissioner. The records, accounts, and loan files shall be available for examination and audit by the Commissioner at any reasonable time. Unless an exception is approved by the Commissioner, borrowers will be required to have an annual audit made of the records of relending programs and economic enterprises financed with revolving loan funds, by a certified public accountant or a firm of certified public accountants or other qualified public accountants satisfactory to the Commissioner.