It doesn't have one. The calculator keeps track of whether you've hit a digit-entry key since you last pressed a function key. If you haven't, then the calculator computes the value and displays it. If you have hit a number-entry key, it stores the value. Thus, when the book says something like "press CPT then press PMT", you just need to press PMT.
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That depends on what you want to compute. For example, to compute the payment, you would press the PMT key. To compute the future value, you would press the FV key. Do you want one in particular?
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