Parens like calculator

[Smudgeboss]

I got a Galaxy S for Christmas and was a Palm user before. I used the TVM (time value of money) function on a shareware calculator called Parens for years. it worked like a dream. I am looking for something that is similar in Android. Here are it`s functions in the TVM. the variables are number of payments per year (eg 52 for weekly), Present value of the loan, Future value of the loan, payment amount, annual interest rate, and number of payments. Any one of the variables could be left blank and the rest filled in to give the questioned value. anyone have insight into which one works like this?

thanks