All available cash (from the current funds, restricted funds, agency funds and endowment income) will be pooled for investment purposes. All interest income will be booked originally in the current fund. The Cash Manager will compute a monthly weighted average yield on the total of cash and cash equivalent securities. The Comptroller will pay from the current fund a portion of this income to specific fund balances, depending on size and permanence of the fund balances in the accounts. The amount will be computed by multiplying the monthly weighted average yield to the monthly weighted average fund balance. For the endowment fund, the yield will be applied to the weighted average of endowment funds held within the current fund during the month.