The rate of interest to be borne by the bonds need not be uniform for all bonds of the same issue, series or division and shall be the rate or rates fixed and determined by the committee in a resolution adopted prior to the sale of the bonds or as specified in the bid accepted by the State Treasurer if the bonds are sold on the basis of the bidder naming the interest rate or rates, in which event the State Treasurer shall fix such rate or rates in conformity with the bid of the successful bidder.