Section 99.090 - Rentals, how fixed1. It is hereby declared to be the policy of this state that each housing authority shall manage and operate housing projects owned by it in an efficient manner so as to enable it to fix the rentals for its very low and low-income tenants at the lowest possible rates consistent with providing decent, safe and sanitary dwelling accommodations, and at rates not higher than rental guidelines established by the United States Department of Housing and Urban Development for such persons. To this end an authority shall fix the rentals for dwellings in its projects at no higher rates than it shall find to be necessary in order: (1) To pay, as the same become due, the principal and interest on the bonds of the authority;(2) To meet the cost of, and to provide for, maintaining and operating its projects, including the cost of any insurance and any other administrative expenses of the authority; and(3) To create (during not less than the six years immediately succeeding its issuance of any bonds) a reserve sufficient to meet the largest principal and interest payments which will be due on such bonds in any one year and to maintain such reserve.2. The provisions of this section shall not apply to any moderate income tenants of the authority.