DESC: This two-color printing calculator features a large fluorescent 12-digit display and fast, 2.7 lines per second. Offers time/date, built-in metal paper arm, PC touch keyboard. Enter two cost/sell/margin variables and the third appears and prints. Includes tax +/- keys, delta percent of change key, 4-key memory, change sign, percent, grand total, date/non-add and backspace keys, sigma, item count and automatic constants.