I used the information about bill lifetimes to put together a Mathematica notebook, which estimates how many of the bills that you have entered are still in circulation at this moment (using the info from your CSV file).
If any of you Mathematica users out there want to try it, let me know. I'd appreciate the feedback, especially on the note age distribution model that I derived.
I'm also wondering if anyone knows of an easy way to convert a Mathematica notebook into an independent application/executable (one that can be used without actually having Mathematica installed)? I know this can be done in C, but I don't know any C.
Thanks,
Tomaz