A district may anticipate the collection of taxes authorized in this chapter, and to carry out the purposes of this chapter may issue bonds payable in not more than ten equal installments with the rate of interest not exceeding that permitted by chapter 74A. An indebtedness shall not be incurred under this chapter until authorized by an election. The election shall be held and notice given in the same manner as provided in section 357F.8, and a sixty percent vote shall be necessary to authorize indebtedness. Subject to section 39.2, subsection 4, both propositions may be submitted to the voters at the same election.