; (4) ensure that investment income generated by funds contributed to an account of the bank will be— (A) credited to the account; (B) available for use in providing loans to projects eligible for assistance from the account; and (C) invested in United States Treasury securities, bank deposits, or such other financing instruments as the Secretary may approve to earn interest to enhance the leveraging of projects assisted by the bank; (5) ensure that any loan from the bank to an eligible charter school entity, local educational agency, public library, or community learning center will bear interest at or below the lowest interest rates being offered for bonds the income from which is exempt from Federal taxation, as determined by the State, to make the project that is the subject of the loan feasible; (6) ensure that repayment of any loan from the bank to an eligible charter school entity, local educational agency, public library, or community learning center will commence not later than 1 year after the project has been completed; (7) ensure that the term for repaying any loan to an eligible charter school entity, local educational agency, public library, or community learning center will not exceed 30 years after the date of the first payment on the loan under paragraph (5); (8) ensure that the funds loaned annually that are used under subsection (a)(1)(C) are limited to a percentage of the total funds loaned that does not exceed the percentage of elementary and secondary school students in the State enrolled in charter schools during the most recent school year for which enrollment data are available; (9) ensure that the funds loaned annually under subsection (a)(1)(D) are used exclusively to connect and improve broadband services