NEED TO SET TAX RATE

Here is the manual link

Press CTRL+F Type in 'tax' top right, press Enter. Scroll through the 19 mentions, Number 3 shows it. Copied and pasted below, but it doesn't show symbol image. The first paragraph covers getting into setting mode and setting date and time, then comes 'Tax Rate'.

https://www.manuallib.com/download//SHARP-EL-1801PIII-OPERATION-MANUAL.PDF

GT • RATE SET GRAND TOTAL / RATE SETTING MODE SELECTOR: "GT": Grand Total "•": Neutral "RATE SET": To set the date, time, and tax rate, set this switch at the "RATE SET" position. Date: • Enter in the order of month, day and year, then press to complete the entry. • Use to separate month, day, and year. • When is pressed, the number entered is evaluated and displayed as "date" if the value is within the following range; "Error" is displayed otherwise, and the previously set date is restored. Month: 1 - 12; day: 1 - 31; Year: 2000 - 2099 (in 4 digits) or 00 - 99 (in 2 digits) Time: • Enter in the order of hour, minutes, then press to complete the entry. (There is no entry available for the seconds value. The clock starts at zero second.) • If the hour/minute digit is less than 10, it is not necessary to enter the first digit "0". • Use to separate hour and minute values. • When is pressed, the number entered is evaluated and displayed as "time" if the value is within the following range; "Error" is displayed otherwise, and the previously set time is restored. Hour: 0 - 23 (24-hour system for the hour entry), Minute: 0 - 59

Tax rate: • Press three times, enter the tax rate, followed by . • A maximum of 4 digits can be stored (decimal point is not counted as a digit). • Only one rate can be stored. If you enter a new rate, the previous rate will be cleared.

more here and videos

https://www.google.com/search?q=sharp+el-1801piii+set+tax+rate
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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

Example: setting 5% tax rate

1. move mode switch to 'rate set '
2. press 5 (for tax rate ) followed by TAX+ button
3. Move mode switch to GT

to add tax to e.g 200 type:
200 TAX+, the result is 210

I Finally figured it out after playing with it for almost 1/2 an hour!

Hit 2nd then Tax + (rate set) it will appear as 0.000 enter your tax rate... mine is 5% so I enter 5.0 then hit 2nd and Tax + (rate set again) And it will work!

It is glorious!!!

Answered By James Soltys from: Edmonton, Alberta Canada

Press +TAX
press the number you need to set it at
Press +TAX again then CA

worked for me!!

Hope this helps

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.

On your Sharp press
CA
C.CE
C.CE
RATE SET(+TAX Key)
175(No decimals for they are not taken into consideration)
RATE SET(+TAX Key)

To check if all went well press
CA
C.CE
C.CE
RATE RECALL(-TAX Key)
It should read your tax rate.

I Finally figured it out after playing with it for almost 1/2 an hour!

Hit 2nd then Tax + (rate set) it will appear as 0.000 enter your tax rate... mine is 5% so I enter 5.0 then hit 2nd and Tax + (rate set again) And it will work!

It is glorious!!!

Answered By James Soltys from: Edmonton, Alberta Canada

I had the same problem and finally figured it out. Here's what you do:

Press C-CE twice
Press +TAX (Rate set)
Key in your new tax rate as an integer (e.g. 5)
Press +Tax (Rate set) again
Press C-CE

Then you're ready to calculate with the new rate!

Now what's the GT button for?