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This works on several different casio calculators
Press AC butoon
Press AND HOLD % /Rate Set button for 2 to 3 seconds - This is important
Press Tax+ button
Input the tax rate you want eg: 12½% = 12.5
Press the % /Rate set button again
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 Do rate the solution.
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. enter in the amount you would like to use as the tax, say 17.5, then press % button twice.
to check it type 100 then tax+ and the answer should be logical.