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The board of trustees may authorize the use of the same actuarial assumptions and interest rate in the calculation of the contributions by the cities for both systems and the accrued liability rate may be a combined rate for both systems . These retail rates , which are used by credit cards or cash exchanges in banks or other exchange services , usually include 1 to 10 percent margins on the top of the interbank rates . When a project is located in leased space for which the lease costs are not paid by the campus but are directly charged to the project , the off-campus rate is applicable . Be sure to mention that you are participating in the National Business Incubation Association Fall Training Institute to take advantage of the special rate . Each rate set forth on this tariff sheet is the currently effective rate pertaining to the particular rate schedule to which it is referenced , but each such rate is separate and independent and the change in any such rate shall not thereby effect a change in any other rate schedule .