It is lawful for the state of Colorado, the state treasurer, any department, institution, or agency of the state, or any political subdivision of the state to purchase anticipation warrants issued pursuant to section 23-41-118 if such warrants satisfy the investment requirements established in part 6 of article 75 of title 24, C.R.S.; but not more than twenty percent of the total of any specific fund of the state or any of its departments, institutions, agencies, or political subdivisions shall be invested in such warrants.