Financial Calculations in Ada

[rd <162144@gmail.com>]

I'm playing around some with Ada, and today started with the
intent of cooking up a crappy mortgage calculator.  I did the
obvious:

     type Money is delta 0.01 digits 12;
     package MIO is new Ada.Text_IO.Decimal_IO (Money); use MIO;

I hit a brick wall more quickly than usual in that I couldn't
figure out a good way to handle interest rates that might have
a decimal value with more digits than my Money type, such as 7.125.

Can anyone give me any tips on how to handle this sort of thing
in Ada?

-- 
rd