Features 3 Calculators. All Calculators feature tape that can be saved, edited, run and beamed to another PDA. tApCalc Finance: Time Value of Money (PV, FV, PMT, I, n, Amortization)SL, SYD, DB methods of Depreciation, Discounted Cash Flow (NPV and IRR), ... tApCalc Scientific: Standard keys, Sin, Cos and Tan keys, Logarithm base 10, e, Factorial, x^y and x^2, ... tApCalc Desk: Standard keys, TAX+, TAX- keys, Mark Up/Mark Down, Total, ...