10-digit Business Desktop Calculator offers a convenient, accurate way to perform cost-sell-margin calculations. Preprogrammed functions solve cost-sell-margin problems. Enter any two variables and the third appears instantly. Automatic constant quickly performs repetitive calculations. Percent key speeds computation of add-ons and discounts. Solar power allows operation even in low light. Large keyboard makes it ideal for desktop or portable use. Other features include angled display, three-key memory and +/- switch.