If the governing board approves the sale pursuant to § 6-13-11 , and less than the full amount of the purchase price is paid in cash and the remainder is to be paid in annual installments, the purchaser or purchasers shall be given a contract for deed covering such real property. The contract for deed shall be executed in the name of the chairman of the governing board of the political subdivision and attested by the fiscal officer. The contract for deed shall state that the political subdivision agrees to convey all of the right, title, and interest of the political subdivision in and to such real property so sold and every part thereof upon the full performance thereof by the purchaser. The contract for deed shall contain a recital of the terms of the sale, the amount of cash paid at the sale, the amount of each of the annual installments, the date of payment of such annual installments, and the rate of interest thereon. The contract for deed shall require the purchaser to make the payments of principal and interest in the amounts and at the times provided by §