أية كلمة؟

التعريف: “A number used to compute the interest rate for an adjustable-rate mortgage (ARM). The _____ is generally a published number or percentage, such as the average interest rate or yield on Treasury bills. A margin is added to the _____ to determine the interest rate that will be charged on the ARM.. This interest rate is subject to any caps that are associated with the mortgage.”

أول حرف: I

ما هي الكلمة التي يتم تعريفها؟