Revenue bonds issued under the terms of this act shall mature not more than forty years after the date of their issuance. Said bonds shall be sold in such manner as the city determines and shall bear interest at a rate not to exceed the maximum rate of interest prescribed by Kan. Stat. Ann. § 10-1009, payable in the manner determined by the city. The total amount of bonds which may be issued under the terms of this act shall not exceed the cost of the project.