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Heavy-duty, printing calculator prints 4.8 lines per second in two colors. Your printouts will feature positive numbers in black and negative numbers in red on standard-size paper rolls. For easy viewing, the extra-large, blue fluorescent display features 12 digits (17.0 mm) with punctuation. Grand Total Key adds the grand total of several calculations such as the total prices times units on an invoice. Use the Average Key to find the "mean or average. Mark-Up Key performs mark-ups, cost/sell/margin calculations, percent changes, and automatic add-on/discounts. Calendar/clock function displays and prints date and time. The 4-key memory includes memory plus, memory minus, recall and clear memory keys. The deluxe commercial-quality calculator also includes floating (F) or fixed decimal (6-3-2-1-0), add (A) and constant (K) modes, item count, and round up/down/off selector. The calculator operates on AC power.