Section 1810.1 - Information concerning interest rates, amortization, guarantee fee, annual charge, and fixed period(a) Tables for computing the interest rates (including the annual charge rates and length of fixed period for initial repurchase agreement for insured loans), tables for use in determining the amounts of interest on loans at different rates, tables providing factors in amortizing loans, and the guarantee fee for guaranteed loans, may be obtained from any County, District, or State Office of the Agency (Rural Business-Cooperative Service and Rural Housing Service of the U.S. Department of Agriculture) or from its National Office at 14th and Independence Avenue SW., Washington, DC 20250.(b) In the event that the tables provided for in paragraph (a) of this section do not furnish adequate information, questions should be directed to the Assistant Administrator, Finance Office, U.S. Department of Agriculture, 1520 Market Street, St. Louis, Missouri 63103.56 FR 11503, Mar. 19, 1991, as amended at 80 FR 9865 , Feb. 24, 2015