The authority shall have the power to make such payments to the United States of America as the directors deem necessary to cause the interest on any bonds of the authority to be and remain exempt from federal income taxation. The authority shall have the power to make agreements respecting the investment of funds of the authority necessary in order that the interest income on bonds of the authority be and remain exempt from federal income taxation.
Ala. Code § 22-3A-24 (1975)