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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Financial Calculations in Ada
References: <lnwsjgkluz.fsf@nuthaus.mib.org>
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Date: 2008-07-21T00:11:27-05:00
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>An interest rate isn't an amount of money, so don't use type Money to
>represent it.
  "delta 0.01" is good for display.  It also works if you only add,
subtract, and multiply by integers.  Once your arithmetic goes beyond
that, precision and rounding become a policy decision. For instance,
at a rate of 7.125% is the total interest, rounded to pennies,
on three $50 loans .07125*50 = 3.5625, 3.56 * 3 = $10.68
Or is it 3*3.5625  = 10.6875, rounded to $10.69?