If any such proposition is approved at such election in the manner required by part 8 of article 1 of title 32, C.R.S., the district is authorized to incur such indebtedness or obligation, enter into such contract, or issue and sell such bonds of the district, as the case may be, all for the purposes and objects specified in the proposition submitted, in the amount so provided, and at a rate of interest such that the maximum net effective interest rate specified in the proposal is not exceeded. The bonds may be sold at public or private sale, as determined by the board to be in the best interests of the district. Submission of the proposition of incurring such obligation or bonded or other indebtedness at such an election shall not prevent or prohibit submission of the same or other propositions at subsequent elections called for such purpose.L. 88: Entire part added, p. 1141, § 1, effective May 6.