Texas Instrument BA II+ Financial Calculator

Performs common math as well as various financial functions
Worksheet mode includes tables for amortization, bond, depreciation, and compound interest.
Built-in memory for storage of previous worksheets. Second key feature to calculate terms fast.
Can perform cash-flow analysis and advanced list-based statistics.
Time-value-of-money and Amortization keys solve problems including: pension calculations, loans, mortgages, etc.