Solution #1 has it backward..
(tax rate), STR, TAX+ (or TAX-)
Example- San Francisco sales tax = 9.5%
9.5, STR, TAX+.
now it functions as (amount entered) plus tax.
Example- find the total with tax for a purchase of $14.99
Calculator will show 16.41
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Move 'GT' '.' 'RATE SET' selector to 'RATE SET'
Tax / discount rate: • Press the TOTAL key twice, enter the tax rate, followed by the TAX+ key. •
Press the TOTAL key twice, enter the discount rate, followed by then TAX- key • A maximum of 4 digits can be stored (decimal point is not counted as a digit). Note: • Be sure to set above noted selector to the "•" position after storing an each rate. • For the conversion rate and the tax / discount rate, a single value can be stored for each. If you enter a new rate, the previous rate will be clear
Easy. Press M- key [has RATE SET] above it. This will shown your current setting say 17.5. Amend to 20.0 and Press M- key again. Rate should now be set at 20%.
Test by entering:
100 and pressing +TAX key - Answer should be 20.
100 and pressing -TAX Key - Answer should be 83.33
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.
1. Be sure to switch to "rate set" from GT
2. Enter the tax amount like so - if your tax rate is 7% type in 7%
3. Go back to the GT setting and it should work...at least that is how I fixed mine! I did the same thing last week & have no manual!