The HP F2231AA#B12 Platinum Financial Calculator is a time-tested classic HP calculator which continues to perform. It offers an easy-to-use layout, one-line LCD display and efficient RPN data entry. Calculating loan payments, interest rates and conversions, standard deviation, percent, TVM, NPV, IRR, cash flows and bonds are done with ease with over 120 built-in functions. The statistical and mathematical features include cumulative statistical analysis Std. deviation, mean, weighted mean Linear regression Forecasting, correlation coefficient Total. This classic is dieal for use in real estate, finance, accounting, economics and business work.