How do you set the tax rate on the sharp el 1801 V calculator?

To set the tax rate on the Sharp EL-1801V calculator, press the "TAX" button followed by the "SET" button to enter the tax rate setting mode. Then, input the desired tax percentage (for example, 8 for 8%), and press the "ENTER" button to confirm. Finally, exit the tax setting mode by pressing the "TAX" button again. The calculator will now use the specified tax rate for calculations.