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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.
Push the CA button
Hold down the set key (%) until the 0 prints and shows on the screen.
Then type in the new tax amount and hit Tax+ .
You will also need to repeat the above for the Tax- .
This works for my DR-220HD Casio Calculator.
make sure you are in "print mode"
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 tax rate
step 5 press the % button
now check to make sure that is correct.