Casio calculator MS-8TV

SETTING YOUR TAX RATE
you hold your set % button down for three seconds until set shows again, then hit tax rate button it shows your tax rate, change your tax rate then hit set your tax rate should be set.



cliff notes:
hold set% button
hit tax+ button
change the desired %
hit set done

For normal % calculations, it works as follows:

100 x 5 % . . . the display should read 5

100 x 5 % + . . . the display should read 105 which is 5 added to 100

100 x 5 % - . . . the display should read 95 which is 5 subtracted from 100

The SET/% key is indeed dual function although SET isn't initiated until the button is pressed AND held down for a few seconds. When that is occurring, you display should be blank for those few seconds after which SET will be indicated on the display indicating it is ready for input.

otherwise, . . .

Make sure you are not in the SET mode. The display should be clear with nothing but 0 showing. You might also want to press AC before beginning calculations.

HOW DO I SET THE TAX RATE?

Helpful thank u

It sounds like the Percent key has a dual function. Thee should be a way to toggle the feature by either holding a function or 2nd key then pressing the percent key. Good luck. John