RPN (Reverse Polish Notation) calculator includes more than 120 built-in functions and allows 20 different cash flows for internal rate of return and net present values. Calculates loan and mortgage payments, converts interest rates, figures bond prices and yields. RPN keystrokes optimize data entry and calculation performance. Program up to 99 keystrokes into memory and then executes with the push of a single button. Other functions include depreciation, percent change, cumulative statistical analysis, standard deviation, mean, weighted mean, linear regression, forecasting, correlation coefficient, date arithmetic, undo, backspace keys and power off memory protection. Calculator automatically shuts off after 10 minutes of nonuse. Calculator has a 1 line x 10 character, liquid crystal display (LCD). The enclosure material is made of plastic and brush aluminum and the key tops are made of plastic. Includes batteries and synthetic leather pouch.