12-digit commercial desktop calculator features a large, bright fluorescent display with automatic three-digit punctuation. Multiple Use key simplifies business calculations to save time and increase efficiency by handling functions like margin, markup, selling prices, costs and percent changes. Grand Total function adds the grand total of several calculations. Other functions include independently accessible four-key memory, round up/off/down, definable adding mode, fixed (6,3,2,1,0) and floating decimal, constant and GT mode selectors, time calculation in hours, minutes, seconds), and two-key rollover. Design features contoured plus/equal and minus/equal. Frequently used multiplication, zero, and plus/equals keys are extra-large.