In determining the cost of a project, the governing body may include all cost and estimated cost of the acquisition, construction, reconstruction, improvement, betterment, and extension of the project and any related public improvements, all engineering, inspection, fiscal, legal, administrative, and printing expense, the interest which it is estimated will accrue during the construction period and for six months thereafter on money borrowed or which it is estimated will be borrowed pursuant to sections 469.152 to 469.165, and bond reserves and premiums for insurance of lease rentals pledged to pay the bonds.