·% Off key is what you've added your own
- Also wore copy key of display data
Displaying the one before the input data to the data display of the top
The number of digits - is the 12-digit display

[% Use of off]
999 [=] 888 [% off]
% Enter the numeric value that you want to the calculation of off and press the "=" key
Then
Enter a 5 if it is off you want numerical value 5% and press the "% off"
You can re-calculate any number of times with 888 [% off] after this