Bonds, notes or other obligations issued under authority of this chapter may be sold by the municipality at par, at a discount or at a premium, together with accrued interest. Notwithstanding the terms of any resolution or ordinance authorizing the issuance of bonds bearing a single rate of interest prior to October 1, 1977, the bonds, notes or other obligations may bear a single rate of interest, may bear different rates of interest for the same or for different maturities or may contain provisions for the method or manner of determining such rate or rates or the time or times at which interest is payable. The proceeds arising from the sale of any bonds, notes or other obligations issued under the authority of this chapter shall be delivered to the treasurer of the municipality and kept by him in accounts separate from other funds of the municipality. Said proceeds shall be expended only for the purposes and subject to the provisions of this chapter, provided the proceeds of sale of any bonds, notes or other obligations shall first be applied to the payment of such temporary notes as have been issued in anticipation of such issue.