Cost-of-funds index was down in West.

SAN FRANCISCO -- The Federal Home Loan Bank of San Francisco said the September monthly weighted average cost of funds index for 11th District savings institutions was 3.881%.

The index, which is used to calculate interest on many adjustable-rate mortgage loans, was down from August's 3.958%.

The index reflects what savings institutions in Arizona, California, and Nevada pay on their various sources of mortgage money.

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