The bonds issued hereunder shall be in denominations to be prescribed by the state finance committee and may be sold in such manner and in such amounts and at such times and on such terms and conditions as the committee may prescribe. If the bonds are sold to any purchaser other than the state of Washington, they shall be sold at public sale, and it shall be the duty of the state finance committee to cause such sale to be advertised in such manner as it shall deem sufficient. Bonds issued under the provisions of RCW 47.26.400 through 47.26.407 shall be legal investment for any of the funds of the state, except the permanent school fund.