Studies have shown that if you are reducing a price, you are better off using a price-off amount rather than a percentage off.
People are suspicious of the vague statements of discount percentage. Also, many cannot bother or unable to calculate a percentage off discount.
Instead of announcing a price reduction of 10% on a $10 item, you are better off announcing a price reduction of $1.
In both cases, the price was reduced from $10.00 to $9.00, but the $1 is real, 10% is not.
Here is how you can do this at the point of sale. See the diagram above where the red arrow points. This discount can be set up to be preset, so it is one button handling.
Note if in changing the prices you mucked it up and want to start again, press the F7 button.