program 20, output 2...annuity
how much munee du yu hafta put up tu get x $/month?
krats kall this "net present value (NPV)"
or "fyucher value av inkum streem"

   Annuity suppli yu with x $/month wen yu retire.  For "immediate" annuity:
Yu suppli money & start getting munee out in 1 month.  Like a banker hu
lone munee & sumwon pae him x $/month.  Yer the banker & giv self x $/month.
Yer munee ern interest.  $/month yu get is part interest & part eet up prinsapel.
How much yu kan get depend on how long yu liv.  Program yuze IRS standard
life spekt tabel.
input kan inklude kommas, $, %, *, wotever;  big numbers...k=1000, m=1,000,000
  waet...browser reed skript stuff