Notes issued under this chapter shall be sold by the state bond committee in the manner and at the price or prices as it shall determine, at either public or private sale; however, a note sold under this chapter may not be sold for less than par and accrued interest or at an interest rate exceeding 11 percent a year or that rate of interest that is 110 percent of the rate of Bond Buyer Index of 20 Municipal Bond Average Yields for the week previous to the date of sale of the notes, whichever is higher.