SOURCE: I have an Ativa AT-P1000 calculator and do not
Turn the top-right switch to the 'ON' position.
Press the Calendar/clock button until you see the time in the display.
Press and hold the M+= button until the seconds disappears and the digits on the display start blinking. Use the number pad to set the time.
From the manual
GRAND TOTAL / RATE
SETTING MODE SELECTOR:
"GT": Grand Total "•": Neutral "RATE SET": Rate setting
• Enter the adding tax rate, then press .TAX+
• 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.
Pulling plug will reset the tax rate.
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