Finance Workbench for the iPhone provides you with an all encompassing solution to guage your net worth. Key features of the Finance Workbench Include: Compound Interest Calculator: Calculate the accumalated interest over time. EMI Calculator: Know how much you need to pay each month towards your loan. Internal Rate of Return (IRR): Measure and Compare the profitability of your investments. Black-Scholes Calculator: Figure out the value of a call or put option based on the scrip price.