HP 50g Graphing Calculator - Manual (Page 798)

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(In RPN mode, we would have used 1136.22 ` 2 `/ ).
Press @@OK@@ to enter this new value. The input form will now look like this:
Press !TYPES to see the type of data in the PMT field (the highlighted field). As a
result, you get the following specification:
This indicates that the value in the PMT field must be a real number. Press @@OK@@
to return to the input form, and press L to recover the first menu. Next, press the
`
key or the $ key to return to the stack. In this instance, the following
values will be shown:
The top result is the value that was solved for PMT in the first part of the
exercise. The second value is the calculation we made to redefine the value of
PMT.