[iPhone God App] It was found using the 12Calc actually

12Calc is a full version of the well known HP12C for the iPhone and iPad. It also includes an audit tape, unit converter, worksheets, rotated views, user guide and HD graphics optimized for iPad and iPhone retina displays.

•Audit Tape: The audit tape keeps a record of your calculations. You can review and mail the results of computations with the tape tool.

•Unit Converter: Convert between a wide variety of common units and currencies. Currency rates can be downloaded from the internet.

•Work Sheets with interactive graphs: Auto Purchase, Black-Scholes, Bond, Break-even, Cash Flow analysis, Date, Depreciation, Interest Conversion, Lease, Loan Amortization, Margin&Markup, Ratios, Refinance, Statistics, Tip, TVM

•Rotated view: Rotate to the vertical orientation to get a larger button layout of the most commonly used functions.

•Built-in user guide: A full user guide is included and is always a single touch away for handy reference.

•HD Graphics: Graphics optimized for both retina and standard resolution screens. Choose from multiple color schemes or create your own colors on the iPad.