I am trying to do a simple Pro Rata calculation.  $185 is paid for a
year of service.  The service is cancelled during the year and money
is owed back to the customer.  I am getting an error on what should be
a simple calculation.

Cell A18 is Number with 2 decimals 185.00
Cell A22 is Date 6/7/2007 as the start of the year of service
Cell A23 is Date 6/7/2008 as the end of the year of service
Cell A24 is Date 9/17/2007 which is when the service was cancelled.

Cell A25 is Number with 0 decimals 366.  This is cell A23 - A22 to
calculate the number of days in the year of service.  2008 is a leap
year so this is 366.

Cell A27 is Number with 0 decimals 102.  This is cell A24 - A22 to
calculate the number of days the service was used (6/7/2007 to
9/17/2007).

Cell A28 is Number with 0 decimals 264.  This is cell A23 - A24 to
calculate the number of days the service was not used (9/17/2007 to
6/7/2008).

Cell A30 is Number with 3 decimals 0.721.  This is A28/A25 to
calculate the pro rata amount of the unused service.

Cell A36 is Number with 2 decimals 133.44.  This is the incorrect
result of A30 * A18.  The correct answer should be 133.39.  I should
see 133.39 if my calculation is A30*A18 but I see 133.44 instead.

Any ideas?

Thanks in advance, Argar Largar