Monroe Systems for Business 6120X 12-Digit Business Medium Duty Calculator, Black 4-key independent memory Group, grand total, tax, tax + and tax -, n-count, mark-up, mark-down Black & red print with print speed of 3.6 lines per second Perfect for small businesses, office, or home use Print speed of 3.6 lines per second 4-key independent memory that will allow users to simultaneously run multiple math problems, all while having the ability to store their respective tax rates Standard 5/4 rounding, round up, or truncate options Backspace key to correct entries Markupfeature to compute profit margins Extra large plus and minus keys Slide switch to selectrunning subtotal or grand total