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SIGMA CR2000 How do I use the -% on my cash register?

I need to know how to deduct a percentage from the total on a transaction, I know there is a -% button on the till but do not know how to use it. I am having a sale 25% off sale and need to use this
How do I use the -% on my cash register?
Lynn Hurle, January 2014
link Click here to see other fixes for SIGMA CR2000.