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Re: Casio DR-250HD 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.
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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.