Broken out from OFFICE-916

TBILLEQ

• Excel gives the formula:
  "TBILLEQ is calculated as TBILLEQ = (365 x rate)/360-(rate x DSM), where DSM
  is the number of days between settlement and maturity computed according to
  the 360 days per year basis."
  That's wrong - should be (365 x rate)/[360-(rate x DSM)]. Also: using the
  360 day year is vital information which needs to be included.

[ed:] TODO: add formula.

• "bond-equivalent yield for a treasury bill" is probably lifted from Excel's
  Help, and comes across as jargon; needs more explanation, especially for
  non-US people.

[ed:] TODO: any native English speaker knowledgeable in that domain?