(a) Moneys in the General Bond Retirement Fund, the Special Assessment Bond Retirement Fund, the Federal portion of any Urban Renewal or Neighborhood Development Program Fund, or of any other fund not eligible for inclusion in the Treasury Investment Fund, which are not needed for a period of time to satisfy the probable requirements of money for such fund, may be invested in obligations permitted by applicable law.
(c) All earnings on investments of moneys of any specific fund pursuant to this section shall be credited to such fund.