Casio JF-100TE Calculator "hs 85te" Questions

...hs-85te calculator Thanks press red c/ac button then press and hold % button untill setexch appears on the screen, (it will go blank for 3 sec) then press tax+ which will display the current tax. ...

...HS-85TE? I have tried unsuccessfully to RETURN IT TO 17.5% setting. Press the red "ON" button and hold it. Press and hold the "% (SET)" button and hold it. Release the red "ON" button. Continue to ...