The governing body of a municipality, in determining cost for purposes of 7-7-4421, may include:
(1) all costs and estimated costs of the issuance of revenue bonds, including a permissible underwriter's discount, if any;
(2) all engineering, inspection, fiscal, and legal expenses; and
(3) interest estimated to accrue during the construction period and for 6 months after construction on money borrowed or on money that it is estimated will be borrowed pursuant to this part.