Buy all 3 Calculators for less than the price of 2 at 35% discountAll Calculators feature tape that can be saved, edited, run and beamed to another PDA. tApCalc Finance features Time Value of Money (PV, FV, PMT, I, n, Amortization)SL, SYD, DB methods of Depreciation Discounted Cash Flow (NPV and IRR) Bond Price and Yield Standard Keys Tape Save, Load, Edit, Run, Beam and Clear Thousand Grouping Regional number format support Print from Device.tApCalc Scientific features Standard keys Sin, Cos and Tan keys Logarithm base 10, e Factorial x^y and x^2 Sqrt , 1/x, Rnd Memory Keys Tape Save, Load, Edit, Run, Beam and Clear Thousand Grouping Regional number format support Print from Device.tApCalc Desk features Standard keys TAX+, TAX- keys Mark Up/Mark Down Sub-Total, Total and Grand Total Sqrt, 1/x Memory Keys Tape Save, Load, Edit, Run, Beam and Clear Thousand Grouping Regional number format support Print from Device.