All general obligation bonds issued by the District shall be sold by the District upon sealed bids to the highest and best responsible bidder who specifies the lowest net interest cost for such bonds. The Board shall publish at least once, in a newspaper published in and having general circulation in the District, a notice of the time, date and place when and where sealed bids for the purchase of such bonds will be received and publicly opened, read and tabulated, which such date shall not be less than 10 days after the date of such publication. Any such bonds shall be sold for not less than par plus accrued interest to the date of delivery.