How to discount the entire sale

**Assumptions: Selling screen is present.**
Step	Keys to press	Result
1	+	Press both keys at the same time. A window prompting for a discount percentage will appear.
2	15	Enter a percentage then press enter. A window will appear asking if you desire to have the discount applied to previously entered lines.
3	or	The operator may apply the discount percentage to previously entered lines, (Y) or set the discount percentage for any new lines added (N).