Commercial Desktop Calculator with Equals Plus Logic prints 46 lines per second in two colors Printer uses a twocolor twin spool ribbon Design features a lefthand total key, extralarge fluorescent display, 12digit capacity, and builtin metal paper arm Two independent tax keys allow you to easily compute two different tax rates such as citycounty or countystate Costsellmargin keys allow you to quickly and easily solve costsellmargin problems by entering two variables, and the third appears and prints Calculator displays and prints time and date at the touch of a key Other functions include markupgross profit margin key, fourkey independent memory, Delta percent of change, percent key, change sign key, grand total, item count, datenonadd key, square root key, backspace key, and automatic constants