The governing authorities of such municipality shall have power to pay out of their general fund, or out of any special fund that may be provided for that purpose, such portion of the cost of the proposed improvement as they may deem proper. Interest accrued while an improvement is under construction, and for six (6) months thereafter, together with interest on interim financing authorized by Section 21-41-45 allocable on a pro rata basis to each such improvement, shall be deemed part of the cost thereof. Actual engineering and inspection costs, properly chargeable to any improvement, shall be deemed a part of the cost of the improvement. All costs for the issuance of the bonds hereinafter provided for shall be deemed part of the cost of the improvement.
