The treasurer of state may invest in SaveNOW linked deposits under sections 135.101 to 135.106 of the Revised Code, provided that at the time of placing any SaveNOW linked deposits the combined amount of investments of public money of the state in linked deposits of any kind is not more than twelve per cent of the state’s total average investment portfolio as determined by the treasurer of state. When deciding whether to invest in SaveNOW linked deposits, the treasurer of state shall give priority to the investment, liquidity, and cash flow needs of the state.