INTEREST (C)Copyright 1993 William H. Decorie  All rights reserved.

This simple program is used when figuring out simple loans.  By simple loans
I don't mean loans with simple interest; I mean loans with one initial
balance and a flat entire-term rate.  Car and personal loans are usually
this kind of loan.  Mortgages are usually not this kind of loan.  I am not
an accountant and I don't really understand all of their mumbo-jumbo voodoo
math, but this program does work properly for what it's designed for.  It
also does not amortize, whatever that is.

There are 4 aspects to a loan:  the loan amount, the term (# months to pay
it back), the annual percentage rate, and the monthly payment.  Although
this program is hardwired for monthly payments, it would be trivial to
change it to quarterly or weekly payments.  Given any 3 values, this program
will calculate the fourth.

Note that an annual percentage rate ISN'T.  An APR, by government standards,
is the PER PAYMENT RATE multiplied by # PAYMENTS PER YEAR.  This is why
my program will display the ANNUAL percentage rate and the ACTUAL percentage
rate.  You will notice quite a difference, especially at higher rates.
Mathematically, the monthly rate is the APR/12.  It is also the actual rate
to the twelfth root.
