Handheld business analyst calculator features cost-sell-margin keys that allow you to quickly and easily solve CSM problems. Simply enter two variables, and the third appears. Functions include three-key independent memory; automatic constants; percent key; square root; change sign key, and backspace key. Design offers an extra large, 10-digit, tilt liquid crystal display (LCD); and nonslip rubber keys. Dual power source include solar and battery. Business analyst calculator includes a protective, hard shell case that slides onto calculator.