1. The county commission may, on behalf of the district, issue bonds not to exceed ninety percent of the total amount of the assessments levied under the provisions of sections 243.550 to 243.553, in denominations of not less than one hundred dollars, bearing interest from date at a rate not to exceed six percent per annum, payable semiannually, to mature at annual intervals within twenty years, commencing after a period of years, not later than five years, to be determined by the county commission, both principal and interest payable at some convenient banking hours or trust company’s office to be named in the bonds, which bonds shall be signed by the presiding commissioner, attested by the signature of the county clerk.

2. All of said bonds shall be executed and delivered to the county treasurer, who shall sell the same in such quantities and at such dates as the county commission may deem necessary to meet the payments for the works and improvements in the district. The bonds shall not be sold for less than ninety-five cents on the dollar, with accrued interest, shall show on their face the purpose for which they are issued, and shall be payable out of money derived from the assessment levied under the provisions of sections 243.550 to 243.553. The bonds shall not be payable out of funds of the county and are not obligations of the county.