Feature: Larger display makes more data easier to read. Key operations are stored in a buffer, so nothing is lost even during high-speed input. Designed and engineered for easy operation. Calculate the cost, selling price, or margin of profit on an item, given the other two values. Tax calculation and currency conversion functions. Regular percentage calculations. All the mark-up/mark-down capabilities of an adding machine for simplified cost and profit calculations. Positive values are shown in black, and negative values are shown in red for easy checking.The value indicates the number of lines printed per second.