How to set tax rate on Activa P3000 calculator

SOURCE: Changing the % tax setting on my Casio calculator

step 1 pess the AC button step 2 press and hold for two seconds the % button step 3 press the tax+ button step 4 input 17­.5 step 5 press the % button that should be the tax set you can check it is set correctly by pressing the AC button and then the tax+ and 17.5 should be displayed

SOURCE: casio MS-120TE tax rate

Found this on the casio site worked fine on my ms-120TE
1. Press [AC]
2. Hold [SET/%] key for about 2 seconds until set and a 0 is displayed
3. Press [TAX+]
4. Input the tax rate
5. Press [SET/%]

this is the link:- http://www.casio.com/support/content/AF64A1AC-193D-4650-A9A9-98BB6FE26CFE

SOURCE: how to set the tax rate

Its easy just type in the tax rate that you want, then hit the rate button. Afterwards leave tax+ pressed and you should see the tax % sign appear above the number you punched in, and THATS IT!!! Easy!!!

SOURCE: Set Tax Rate

First clear all w/ ON/AC.
Enter the tax rate desired eg. 7 for 7% (can you tell I'm in PA)
Press RATE then TAX+
Press C/CE.
The next time you use TAX+ it will calculate and add the value that you set.
Do the same for TAX-, you can use a different value for each as they are separate memories.

SOURCE: CANNOT SET TAX RATE ON MY CANON MP11DX

To change the tax rate on the Canon MP11DX (and most others):

Slide the "GT" button to "RATE", enter your tax rate and hit the "TAX+" button. Once changed, slide the "GT" button back to the "ON" position.