Radio Shack EC-2037 - Manual (Page 9)

9
Percentage
Example: 20% of 720 is 144.
Add-On
Example: 30% added to 540 is 702.
Discount
Example: 800 discounted by 20% is 640.
You Press You See
720
ЧЧЧЧ
20 % 144.
You Press You See
540 + 30 % 702.
You Press You See
800 – 20 % 640.