EXCEL 2003

30,625.010000000000000000000000000000
(30,570.020000000000000000000000000000)

54.989999999998

Why does the sum of these 2 numbers yield the answer shown? The answer is
being compared to the following separate sum below and is yeilding a
different answer as well. The 2 numbers being added or subtracted are not
calculated- they're entered manually.

=15340-15285.01
54.990000000000

If the answer to the second equation is formatted out to more than 12 places
you get something less than the 54.99 I would have expected in both instances.

Appreciate your insight.